CVE-2023-4527

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

Published Sep 18, 2023 CVSS 3.1 · 6.5 Medium EPSS 1.7% KEV · Not listed
Description
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.

Remediation

Vendor Workaround

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

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-5514-1 glibc security update
EUVD EUVD EUVD-2023-54382 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.
Ubuntu USN Ubuntu USN USN-6409-1 GNU C Library vulnerabilities
History
Type Values Removed Values Added
First Time appeared Redhat rhel Els
CPEs cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:rhel_els:6
cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat rhel Els
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Nov 7, 2026, 1:41 PM
Reserved
Aug 24, 2023, 7:36 PM
Status
Modified
Published
Sep 18, 2023, 5:15 PM
Modified
Nov 7, 2026, 2:16 PM
Severity
Moderate
Public date
Sep 12, 2023, 12:00 AM