Red Hat Linux Security Advisories & CVEs
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Latest Red Hat advisories
High [CVE-2024-1753] Buildah: buildah: container escape via improper bind mount validation
A flaw was found in Buildah (and subsequently Podman Build) which allows containers to mount arbitrary locations on the host filesystem into build containers. A malicious Containerfile can use a dummy image with a symbolic link to the root filesystem as a mount source and cause the mount operation to mount the host root filesystem inside the RUN step. The commands inside the RUN step will then have read-write access to the host filesystem, allowing for full container escape at build time. Red Hat has rated this vulnerability as Important rather than Critical because successful exploitation requires user interaction to process a maliciously crafted Containerfile. Additionally, default security hardening in Red Hat Enterprise Linux—specifically SELinux running in Enforcing mode—prevents unauthorized write access to host system files, restricting the potential breakout primarily to unauthorized read operations. Environments where container builds are executed with elevated host permissions against untrusted source definitions face the highest risk. Red Hat severity: Important — CVSS 8.6 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H). Weakness: CWE-59.
High [CVE-2024-1635] out-of-memory error after several closed connections with wildfly-http-client protocol
A vulnerability was found in Undertow. This vulnerability impacts a server that supports the wildfly-http-client protocol. Whenever a malicious user opens and closes a connection with the HTTP port of the server and then closes the connection immediately, the server will end with both memory and open file limits exhausted at some point, depending on the amount of memory available. At HTTP upgrade to remoting, the WriteTimeoutStreamSinkConduit leaks connections if RemotingConnection is closed by Remoting ServerConnectionOpenListener. Because the remoting connection originates in Undertow as part of the HTTP upgrade, there is an external layer to the remoting connection. This connection is unaware of the outermost layer when closing the connection during the connection opening procedure. Hence, the Undertow WriteTimeoutStreamSinkConduit is not notified of the closed connection in this scenario. Because WriteTimeoutStreamSinkConduit creates a timeout task, the whole dependency tree leaks via that task, which is added to XNIO WorkerThread. So, the workerThread points to the Undertow conduit, which contains the connections and causes the leak. This is rated as Important due to the fact that this might be an unauthenticated remote issue exploited by a malicious user, causing a denial of service (DoS) to the affected server.
High [CVE-2024-1488] unrestricted reconfiguration enabled to anyone that may lead to local privilege escalation
A vulnerability was found in Unbound due to incorrect default permissions, allowing any process outside the unbound group to modify the unbound runtime configuration. If a process can connect over localhost to port 8953, it can alter the configuration of unbound.service. This flaw allows an unprivileged attacker to manipulate a running instance, potentially altering forwarders, allowing them to track all queries forwarded by the local resolver, and, in some cases, disrupting resolving altogether. Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.2 Advanced Update Support; Red Hat Enterprise Linux 8.2 Telecommunications Update Service; Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions; and 9 more. Affected products named by the advisory: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Telecommunications Update Service; Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 8.6 Extended Update Support; and 4 more.
High [CVE-2024-1485] decompress can delete files outside scope via relative paths
A flaw was found in the decompression function of registry-support. This issue can be triggered if an unauthenticated remote attacker tricks a user into parsing a devfile which uses the `parent` or `plugin` keywords. This could download a malicious archive and cause the cleanup process to overwrite or delete files outside of the archive, which should not be allowed. Red Hat Openshift has a "Low" rated impact due to the affected code being shipped, but unused. Red Hat severity: Important — CVSS 8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:H). Weakness: CWE-22. Affected Red Hat products: OpenShift Developer Tools and Services; Red Hat OpenShift Container Platform 4. Will not fix / out of support: OpenShift Developer Tools and Services. Red Hat does not currently list a fixing RHSA for this CVE.
High [CVE-2020-25657 +1] M2crypto: bleichenbacher timing attacks in the rsa decryption api - incomplete fix for CVE-2020-25657
A flaw was found in m2crypto. This issue may allow a remote attacker to decrypt captured messages in TLS servers that use RSA key exchanges, which may lead to exposure of confidential or sensitive data. This vulnerability exists due to an incomplete fix for CVE-2020-25657. Red Hat severity: Moderate — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N). Weakness: CWE-203. Affected Red Hat products: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Update Infrastructure 4 for Cloud Providers. Red Hat lists Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Virtualization 4 as not affected. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: m2crypto.
High [CVE-2024-21626] runc container breakout through process.cwd trickery and leaked fds
runc is a CLI tool for spawning and running containers on Linux according to the OCI specification. In runc 1.1.11 and earlier, due to an internal file descriptor leak, an attacker could cause a newly-spawned container process (from runc exec) to have a working directory in the host filesystem namespace, allowing for a container escape by giving access to the host filesystem ("attack 2"). The same attack could be used by a malicious image to allow a container process to gain access to the host filesystem through runc run ("attack 1"). Variants of attacks 1 and 2 could be also be used to overwrite semi-arbitrary host binaries, allowing for complete container escapes ("attack 3a" and "attack 3b"). runc 1.1.12 includes patches for this issue. While a user performs `O_CLOEXEC` all file descriptors before executing the container code, the file descriptor is open when performing `setcwd(2)`, which means that the reference can be kept alive in the container by configuring the working directory to be a path resolved through the file descriptor. The non-dumpable bit is unset after `execve`, meaning there are multiple ways to attack this other than bad configurations. The only way to defend against it entirely is to close all unneeded file descriptors.
High [CVE-2023-6779] off-by-one heap-based buffer overflow in __vsyslog_internal
An off-by-one heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when these functions are called with a message bigger than INT_MAX bytes, leading to an incorrect calculation of the buffer size to store the message, resulting in an application crash. This issue affects glibc 2.37 and newer. The glibc package, as shipped with Red Hat products, is not affected by this vulnerability because this issue was introduced in glibc 2.37, this glibc version is not used by any Red Hat product. Red Hat severity: Important — CVSS 8.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H). Weakness: CWE-193. Red Hat lists Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
High [CVE-2023-6246] heap-based buffer overflow in __vsyslog_internal
A heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when the openlog function was not called, or called with the ident argument set to NULL, and the program name (the basename of argv[0]) is bigger than 1024 bytes, resulting in an application crash or local privilege escalation. This issue affects glibc 2.36 and newer. The glibc package, as shipped with Red Hat products, is not affected by this vulnerability because this issue was introduced in glibc 2.36, this glibc version is not used by any Red Hat product. Red Hat severity: Important — CVSS 8.4 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-122. Red Hat lists Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
High [CVE-2023-6291] Keycloak: redirect_uri validation bypass
A flaw was found in the redirect_uri validation logic in Keycloak. This issue may allow a bypass of otherwise explicitly allowed hosts. A successful attack may lead to an access token being stolen, making it possible for the attacker to impersonate other users. Red Hat severity: Important — CVSS 7.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L). Weakness: CWE-601. Affected Red Hat products: Red Hat build of Keycloak 22; Red Hat build of Keycloak 22.0.7; Red Hat Single Sign-On 7; Red Hat Single Sign-On 7.6 for RHEL 7; Red Hat Single Sign-On 7.6 for RHEL 8; Red Hat Single Sign-On 7.6 for RHEL 9; RHEL-8 based Middleware Containers; Single Sign-On 7.6.6; Migration Toolkit for Applications 6. Red Hat lists Migration Toolkit for Applications 7; OpenShift Serverless; Red Hat Data Grid 8; Red Hat Decision Manager 7; Red Hat Fuse 7; Red Hat JBoss Data Grid 7; Red Hat JBoss Enterprise Application Platform 6; Red Hat Process Automation 7 as not affected. Will not fix / out of support: Migration Toolkit for Applications 6. Red Hat fixing advisory: RHSA-2023:7861, RHSA-2023:7860, RHSA-2024:0804, RHSA-2023:7854, RHSA-2024:0798, RHSA-2023:7856, RHSA-2024:0799, RHSA-2023:7855, RHSA-2024:0800, RHSA-2023:7857, RHSA-2024:0801, RHSA-2023:7858.
High [CVE-2023-52355] tiffrasterscanlinesize64 produce too-big size and could cause oom
An out-of-memory flaw was found in libtiff that could be triggered by passing a crafted tiff file to the TIFFRasterScanlineSize64() API. This flaw allows a remote attacker to cause a denial of service via a crafted input with a size smaller than 379 KB. Primarily, the exploit requires the crafted input to be smaller than 379 KB, imposing a limitation on the potential impact and reducing the likelihood of successful exploitation in practical scenarios. Furthermore, the nature of the vulnerability is limited to denial-of-service attacks, which, although disruptive, do not inherently pose a direct risk of data compromise or system compromise. However, it's important to acknowledge that denial-of-service attacks can still have significant operational implications, particularly in environments reliant on continuous availability. Red Hat severity: Moderate — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-787. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat AI Inference Server 3.2; Red Hat Discovery 2; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8.
High [CVE-2023-6531] gc's deletion of an skb races with unix_stream_read_generic leading to uaf
A use-after-free flaw was found in the Linux Kernel due to a race problem in the unix garbage collector's deletion of SKB races with unix_stream_read_generic() on the socket that the SKB is queued on. Affected product named by the advisory: Red Hat Enterprise Linux 9.
High [CVE-2024-0646] ktls overwrites readonly memory pages when using function splice with a ktls socket as destination
An out-of-bounds memory write flaw was found in the Linux kernel’s Transport Layer Security functionality in how a user calls a function splice with a ktls socket as the destination. This flaw allows a local user to crash or potentially escalate their privileges on the system. Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.2 Advanced Update Support; Red Hat Enterprise Linux 8.2 Telecommunications Update Service; Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions; and 10 more. Affected products named by the advisory: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Telecommunications Update Service; Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 8.6 Extended Update Support; and 5 more.
High [CVE-2024-0567] Gnutls: rejects certificate chain with distributed trust
A vulnerability was found in GnuTLS, where a cockpit (which uses gnuTLS) rejects a certificate chain with distributed trust. This issue occurs when validating a certificate chain with cockpit-certificate-ensure. This flaw allows an unauthenticated, remote client or attacker to initiate a denial of service attack. The issue is marked as moderate because it involves a vulnerability in GnuTLS, specifically affecting Cockpit, which utilizes GnuTLS. This is a bug in the GnuTLS library, Cockpit does not copy this code, but uses the shared lib at runtime. Hence, patching gnutls is necessary and sufficient to address this, hance Cockpit is not affected by this issue. Red Hat severity: Moderate — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-347. Affected Red Hat products: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.2 Extended Update Support; RHODF-4.15-RHEL-9; RHOL-5.8-RHEL-9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat lists Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 3.11 as not affected. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat fixing advisory: RHSA-2024:0533, RHSA-2024:1082, RHSA-2024:1383, RHSA-2024:2094. Affected products named by the advisory: Red Hat package: gnutls; Red Hat package: cockpit.
High [CVE-2023-5981 +1] Gnutls: incomplete fix for CVE-2023-5981
A vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from the response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981. The identified vulnerability in the GnuTLS library, designated as CVE-2024-0553, presents a moderate severity concern due to its potential for facilitating timing side-channel attacks in RSA-PSK ciphersuites. While the flaw allows for the exploitation of timing differentials during the key exchange process, enabling attackers to infer sensitive data, its impact is constrained by several factors. Firstly, successful exploitation requires precise timing measurements and sophisticated analysis techniques, posing a significant barrier to entry for potential attackers. Additionally, the effectiveness of the attack is contingent on environmental factors such as network latency and system load, further limiting its practical feasibility. Red Hat severity: Moderate — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N). Weakness: CWE-203.
High [CVE-2023-6546] gsm multiplexing race condition leads to privilege escalation
A race condition was found in the GSM 0710 tty multiplexor in the Linux kernel. This issue occurs when two threads execute the GSMIOC_SETCONF ioctl on the same tty file descriptor with the gsm line discipline enabled, and can lead to a use-after-free problem on a struct gsm_dlci while restarting the gsm mux. This could allow a local unprivileged user to escalate their privileges on the system. Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.2 Advanced Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Telecommunications Update Service; and 8 more. Affected products named by the advisory: Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 8.6 Extended Update Support; Red Hat Enterprise Linux 8.8 Extended Update Support; Red Hat Enterprise Linux 9.0 Extended Update Support; and 3 more. Affected products named by the advisory: Red Hat Enterprise Linux 9.2 Extended Update Support; Red Hat Virtualization 4 for Red Hat Enterprise Linux 8; RHOL-5.7-RHEL-8.
High [CVE-2023-6563] Keycloak: offline session token dos
An unconstrained memory consumption vulnerability was discovered in Keycloak. It can be triggered in environments which have millions of offline tokens (> 500,000 users with each having at least 2 saved sessions). If an attacker creates two or more user sessions and then open the "consents" tab of the admin User Interface, the UI attempts to load a huge number of offline client sessions leading to excessive memory and CPU consumption which could potentially crash the entire system. While this vulnerability can enable complete compromise of system availability, it is not possible to be triggered in every environment. The impact is rated as Important due to several preconditions (number of users and how many sessions each user has) which are beyond an attacker's control. Red Hat severity: Important — CVSS 7.7 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H). Weakness: CWE-770. Affected Red Hat products: Red Hat Single Sign-On 7.6 for RHEL 7; Red Hat Single Sign-On 7.6 for RHEL 8; Red Hat Single Sign-On 7.6 for RHEL 9; RHEL-8 based Middleware Containers; Single Sign-On 7.6.6. Red Hat lists Red Hat Build of Keycloak as not affected. Red Hat fixing advisory: RHSA-2023:7854, RHSA-2023:7856, RHSA-2023:7855, RHSA-2023:7857, RHSA-2023:7858.
High [CVE-2023-5379] ajp request closes connection exceeding maxrequestsize
A flaw was found in Undertow. When an AJP request is sent that exceeds the max-header-size attribute in ajp-listener, JBoss EAP is marked in an error state by mod_cluster in httpd, causing JBoss EAP to close the TCP connection without returning an AJP response. This happens because mod_proxy_cluster marks the JBoss EAP instance as an error worker when the TCP connection is closed from the backend after sending the AJP request without receiving an AJP response, and stops forwarding. This issue could allow a malicious user could to repeatedly send requests that exceed the max-header-size, causing a Denial of Service (DoS). Affected products named by the advisory: Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7; Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7; Red Hat JBoss Enterprise Application Platform 7; Red Hat Single Sign-On 7.
High [CVE-2023-6394] Quarkus: graphql operations over websockets bypass
A flaw was found in Quarkus. This issue occurs when receiving a request over websocket with no role-based permission specified on the GraphQL operation, Quarkus processes the request without authentication despite the endpoint being secured. This can allow an attacker to access information and functionality outside of normal granted API permissions. Red Hat severity: Important — CVSS 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N). Weakness: CWE-862. Affected Red Hat products: Red Hat build of Quarkus 3.2.9.Final. Red Hat fixing advisory: RHSA-2023:7612.
High [CVE-2023-6610] Kernel: oob access in smb2_dump_detail
An out-of-bounds read vulnerability was found in smb2_dump_detail in fs/smb/client/smb2ops.c in the Linux Kernel. This issue could allow a local attacker to crash the system or leak internal kernel information. Red Hat severity: Moderate — CVSS 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H). Weakness: CWE-125. Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.6 Extended Update Support; Red Hat Enterprise Linux 8.8 Extended Update Support; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.2 Extended Update Support; Red Hat Virtualization 4 for Red Hat Enterprise Linux 8; RHOL-5.8-RHEL-9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat fixing advisory: RHSA-2024:0881, RHSA-2024:0897, RHSA-2024:0724, RHSA-2024:1404, RHSA-2024:1248, RHSA-2024:0723, RHSA-2024:0725, RHSA-2024:2094. Affected products named by the advisory: Red Hat package: kernel-rt.
High [CVE-2023-6606] Kernel: out-of-bounds read vulnerability in smbcalcsize
An out-of-bounds read vulnerability was found in smbCalcSize in fs/smb/client/netmisc.c in the Linux Kernel. This issue could allow a local attacker to crash the system or leak internal kernel information. Red Hat severity: Moderate — CVSS 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H). Weakness: CWE-125. Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.6 Extended Update Support; Red Hat Enterprise Linux 8.8 Extended Update Support; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.2 Extended Update Support; Red Hat Virtualization 4 for Red Hat Enterprise Linux 8; RHOL-5.8-RHEL-9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat fixing advisory: RHSA-2024:0881, RHSA-2024:0897, RHSA-2024:1188, RHSA-2024:1404, RHSA-2024:1248, RHSA-2024:0723, RHSA-2024:0725, RHSA-2024:2094. Affected products named by the advisory: Red Hat package: kernel-rt.