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CVE-2020-29573

Published: 6 December 2020

sysdeps/i386/ldbl2mpn.c in the GNU C Library (aka glibc or libc6) before 2.23 on x86 targets has a stack-based buffer overflow if the input to any of the printf family of functions is an 80-bit long double with a non-canonical bit pattern, as seen when passing a \x00\x04\x00\x00\x00\x00\x00\x00\x00\x04 value to sprintf. NOTE: the issue does not affect glibc by default in 2016 or later (i.e., 2.23 or later) because of commits made in 2015 for inlining of C99 math functions through use of GCC built-ins. In other words, the reference to 2.23 is intentional despite the mention of "Fixed for glibc 2.33" in the 26649 reference.

Priority

Low

CVSS 3 base score: 7.5

Status

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

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

precise Ignored
(end of ESM support, was needs-triage)
trusty Needs triage

upstream Needs triage

xenial Does not exist

glibc
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(2.27-3ubuntu1.4)
focal Not vulnerable
(2.31-0ubuntu9.1)
groovy Not vulnerable
(2.32-0ubuntu3)
hirsute Not vulnerable
(2.32-0ubuntu5)
impish Not vulnerable
(2.32-0ubuntu5)
jammy Not vulnerable
(2.32-0ubuntu5)
precise Does not exist

trusty Does not exist

upstream Needs triage

xenial Not vulnerable
(2.23-0ubuntu11.2)
Patches:
upstream: https://sourceware.org/git/?p=glibc.git;h=d81f90ccd0109de9ed78aeeb8d86e2c6d4600690
upstream: https://sourceware.org/git/?p=glibc.git;h=8df4e219e43a4a257d0759b54fef8c488e2f282e