CVE-2023-4527

Glibc: stack read overflow in getaddrinfo in no-aaaa mode

publishedCWE-121

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.

Technical severity6.5 mediumCVSS 3.1 · CNA: redhat

Published2023-09-18Source updated 2026-11-07

Collected2026-11-072 attributed sources

Fixes and workarounds

Workaround

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

Source: CNA: redhat

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Red Hat Enterprise Linux 8 Red Hat `glibc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.28-225.el8_8.6; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `glibc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.34-60.el9_2.7; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 6 Red Hat `compat-glibc` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 6 Red Hat `glibc` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 7 Red Hat `compat-glibc` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 7 Red Hat `glibc` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Siemens	≥ V3.1.5; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Siemens	≥ V3.1.5; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Siemens	≥ V3.1.5; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 6.5 medium	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H`	CNA: redhat

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://access.redhat.com/errata/RHSA-2023:5453CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2023:5455CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2023-4527CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2234712CNA: redhat · issue-tracking, x_refsource_REDHAT
http://www.openwall.com/lists/oss-security/2023/09/25/1ADP: CVE · x_transferred
https://access.redhat.com/errata/RHSA-2023:5453ADP: CVE · vendor-advisory, x_refsource_REDHAT, x_transferred
https://access.redhat.com/errata/RHSA-2023:5455ADP: CVE · vendor-advisory, x_refsource_REDHAT, x_transferred
https://access.redhat.com/security/cve/CVE-2023-4527ADP: CVE · vdb-entry, x_refsource_REDHAT, x_transferred
https://bugzilla.redhat.com/show_bug.cgi?id=2234712ADP: CVE · issue-tracking, x_refsource_REDHAT, x_transferred
https://lists.fedoraproject.org/archives/list/[email protected]/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/ADP: CVE · x_transferred
https://lists.fedoraproject.org/archives/list/[email protected]/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/ADP: CVE · x_transferred
https://lists.fedoraproject.org/archives/list/[email protected]/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/ADP: CVE · x_transferred
https://security.gentoo.org/glsa/202310-03ADP: CVE · x_transferred
https://security.netapp.com/advisory/ntap-20231116-0012/ADP: CVE · x_transferred
https://cert-portal.siemens.com/productcert/html/ssa-831302.htmlADP: siemens-SADP
https://cert-portal.siemens.com/productcert/html/ssa-082556.htmlADP: siemens-SADP

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