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CVE-2023-4527

Published: 18 September 2023

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.

Notes

AuthorNote
mdeslaur
no-aaaa was introduced in 2.36 by:
https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=f282cdbe7f436c75864e5640a409a10485e9abb2
system needs to be configured in no-aaaa mode in resolv.conf

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
eglibc
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

jammy Does not exist

lunar Does not exist

mantic Does not exist

trusty Not vulnerable
(code not present)
upstream Needs triage

xenial Does not exist

glibc
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
jammy Not vulnerable
(code not present)
lunar
Released (2.37-0ubuntu2.1)
mantic
Released (2.38-1ubuntu5)
trusty Ignored
(end of standard support)
upstream Needs triage

xenial Not vulnerable
(code not present)
Patches:
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4ea972b7edd7e36610e8cde18bf7a8149d7bac4f
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b7529346025a130fee483d42178b5c118da971bb
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b25508dd774b617f99419bdc3cf2ace4560cd2d6

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H