Medium6.5Red Hat Linux

Medium [CVE-2023-4527] stack read overflow in getaddrinfo in no-aaaa mode

This medium-severity Red Hat Linux advisory covers CVE-2023-4527 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat package: glibc.

CVE-2023-4527 Published Sep 18, 2023Updated by vendor Sep 12, 2023

CVE-2023-4527

Affected products & platforms

Red Hat LinuxRed Hat Enterprise Linux

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Summary

A flaw was found in glibc. When the getaddrinfo function is called with the AF_UNSPEC address family and the system is configured with no-aaaa mode via /etc/resolv.conf, a DNS response via TCP larger than 2048 bytes can potentially disclose stack contents through the function returned address data, and may cause a crash.

The no-aaaa stub resolver option was backported only to Red Hat Enterprise Linux versions 8.7 and 9.1. Therefore, previous versions are not affected.

Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H). Weakness: CWE-121.

Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat fixing advisory: RHSA-2023:5455, RHSA-2023:5453.

Affected products named by the advisory: Red Hat package: 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 days ago·verify at source

Fixed versions

glibc-0:2.28-225.el8_8.6
glibc-0:2.34-60.el9_2.7
RHSA-2023:5455
RHSA-2023:5453

Official advisory · high-confidence parse· fetched 9 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Removing the no-aaaa diagnostic option from /etc/resolv.conf will mitigate this flaw.

Official advisory · high-confidence parse· fetched 9 days ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Red Hat Security Data APIofficial
Official vendor source used to discover this advisory; it remains the authority for affected products and remediation. Discovered from the machine-readable feed https://access.redhat.com/hydra/rest/securitydata/cve.json; this link opens the Red Hat Linux advisory index instead of the raw feed document.
Red Hat Linux
Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Red Hat Linux
CVE.org CNA affected-product recordCVE.org
Structured CNA affected[] data independently confirmed the affected product scope; native advisory content remains authoritative.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2023-4527NVD CVE.org MITRE

Discussion(0)

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