CVE-2020-12062

Name	CVE-2020-12062
Description	The scp client in OpenSSH 8.2 incorrectly sends duplicate responses to the server upon a utimes system call failure, which allows a malicious unprivileged user on the remote server to overwrite arbitrary files in the client's download directory by creating a crafted subdirectory anywhere on the remote server. The victim must use the command scp -rp to download a file hierarchy containing, anywhere inside, this crafted subdirectory. NOTE: the vendor points out that "this attack can achieve no more than a hostile peer is already able to achieve within the scp protocol" and "utimes does not fail under normal circumstances.
Source	CVE (at NVD; CERT, 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
openssh (PTS)	bullseye	1:8.4p1-5+deb11u3	fixed
	bullseye (security)	1:8.4p1-5+deb11u5	fixed
	bookworm	1:9.2p1-2+deb12u7	fixed
	bookworm (security)	1:9.2p1-2+deb12u5	fixed
	trixie	1:10.0p1-7	fixed
	forky	1:10.0p1-8	fixed
	sid	1:10.2p1-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
openssh	source	(unstable)	1:8.3p1-1	unimportant

Notes

https://github.com/openssh/openssh-portable/commit/955854cafca88e0cdcd3d09ca1ad4ada465364a1
https://github.com/openssh/openssh-portable/commit/aad87b88fc2536b1ea023213729aaf4eaabe1894
https://www.openwall.com/lists/oss-security/2020/05/27/1
Negligible security impact, a malicious peer can achieve no more than already
able o achieve within the scp protocol.