CVE-2021-20197

Name	CVE-2021-20197
Description	There is an open race window when writing output in the following utilities in GNU binutils version 2.35 and earlier:ar, objcopy, strip, ranlib. When these utilities are run as a privileged user (presumably as part of a script updating binaries across different users), an unprivileged user can trick these utilities into getting ownership of arbitrary files through a symlink.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
binutils (PTS)	bookworm	2.40-2	fixed
	trixie	2.44-3	fixed
	forky, sid	2.47-2	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
binutils	source	experimental	2.35.50.20201209-1
binutils	source	(unstable)	2.37-3	unimportant

Notes

https://sourceware.org/bugzilla/show_bug.cgi?id=26945
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=014cc7f849e8209623fc99264814bce7b3b6faf2
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=1a1c3b4cc17687091cff5a368bd6f13742bcfdf8
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=365f5fb6d0f0da83817431a275e99e6f6babbe04
binutils not covered by security support