CVE-2020-29573

NameCVE-2020-29573
Descriptionsysdeps/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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesELA-725-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
glibc (PTS)jessie, jessie (lts)2.19-18+deb8u14fixed
stretch (security)2.24-11+deb9u1fixed
stretch (lts), stretch2.24-11+deb9u7fixed
buster (security), buster, buster (lts)2.28-10+deb10u4fixed
bullseye2.31-13+deb11u11fixed
bullseye (security)2.31-13+deb11u10fixed
bookworm2.36-9+deb12u8fixed
bookworm (security)2.36-9+deb12u7fixed
sid, trixie2.40-3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
glibcsourcejessie2.19-18+deb8u11ELA-725-1
glibcsource(unstable)2.23-1

Notes

https://sourceware.org/bugzilla/show_bug.cgi?id=26649
https://sourceware.org/pipermail/libc-alpha/2020-September/117779.html
https://bugzilla.redhat.com/show_bug.cgi?id=1905213#c5
Fixed by: https://sourceware.org/git/?p=glibc.git;h=d81f90ccd0109de9ed78aeeb8d86e2c6d4600690 (glibc-2.22)
Fixed by: https://sourceware.org/git/?p=glibc.git;h=8df4e219e43a4a257d0759b54fef8c488e2f282e (glibc-2.23)

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