CVE-2023-4813

Glibc: potential use-after-free in gaih_inet()

publishedCWE-416

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.

Technical severity5.9 mediumCVSS 3.1 · CNA: redhat

Published2023-09-12Source updated 2026-11-07

Collected2026-11-072 attributed sources

Fixes and workarounds

Workaround

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.

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 8.6 Extended Update Support Red Hat `glibc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.28-189.8.el8_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 Virtualization 4 for Red Hat Enterprise Linux 8 Red Hat `glibc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.28-189.8.el8_6; < * (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: unknown	CNA: redhat
Red Hat Enterprise Linux 6 Red Hat `glibc` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unknown	CNA: redhat
Red Hat Enterprise Linux 7 Red Hat `compat-glibc` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 7 Red Hat `glibc` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Siemens	≥ V3.1.0; < V3.1.5 (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Siemens	≥ V3.1.0; < V3.1.5 (affected, custom) Other versions: unknown	ADP: siemens-SADP
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Siemens	≥ V3.1.0; < 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 / 5.9 medium	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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/errata/RHSA-2023:7409CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2023-4813CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2237798CNA: redhat · issue-tracking, x_refsource_REDHAT
http://www.openwall.com/lists/oss-security/2023/10/03/8ADP: 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/errata/RHSA-2023:7409ADP: CVE · vendor-advisory, x_refsource_REDHAT, x_transferred
https://access.redhat.com/security/cve/CVE-2023-4813ADP: CVE · vdb-entry, x_refsource_REDHAT, x_transferred
https://bugzilla.redhat.com/show_bug.cgi?id=2237798ADP: CVE · issue-tracking, x_refsource_REDHAT, x_transferred
https://security.netapp.com/advisory/ntap-20231110-0003/ADP: CVE · x_transferred
https://cert-portal.siemens.com/productcert/html/ssa-398330.htmlADP: siemens-SADP

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