Medium [CVE-2023-4813] Glibc: potential use-after-free in gaih_inet
This medium-severity Red Hat Linux advisory covers CVE-2023-4813 affecting Red Hat Enterprise Linux 8.6 Extended Update Support, Red Hat Enterprise Linux 9, Red Hat Virtualization 4 for Red Hat Enterprise Linux 8.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
A flaw has been identified in glibc. In an uncommon situation, the gaih_inet function may use memory that has been freed, resulting in an application crash.
This issue is only exploitable when the getaddrinfo function is called and the hosts database in /etc/nsswitch.conf is configured with SUCCESS=continue or SUCCESS=merge. This issue is only exploitable when the condition detailed in the description is present in the system.
However, all glibc versions shipped in Red Hat Enterprise Linux are vulnerable to this issue. Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-416. Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.6 Extended Update Support; Red Hat Enterprise Linux 9; Red Hat Virtualization 4 for Red Hat Enterprise Linux 8; 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-2023:5455, RHSA-2023:7409, RHBA-2024:2413, RHSA-2023:5453.
Affected products named by the advisory: Red Hat package: glibc; Red Hat package: compat-glibc.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
- glibc-0:2.28-225.el8_8.6
- glibc-0:2.28-189.8.el8_6
- glibc-0:2.34-100.el9
- glibc-0:2.34-60.el9_2.7
- RHSA-2023:5455
- RHSA-2023:7409
- RHBA-2024:2413
- RHSA-2023:5453
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
Mitigation checklist
- Removing the "SUCCESS=continue" or "SUCCESS=merge" configuration from the hosts database in /etc/nsswitch.conf will mitigate this vulnerability. Note that, these options are not supported by the hosts database, if they were working before it was because of this bug.
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
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