CVE-2018-20685

Name	CVE-2018-20685
Description	In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
References	DLA-1728-1, DSA-4387-1
Debian Bugs	919101

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
openssh (PTS)	buster	1:7.9p1-10+deb10u2	fixed
	buster (security)	1:7.9p1-10+deb10u1	fixed
	bullseye	1:8.4p1-5+deb11u1	fixed
	bookworm, sid	1:9.2p1-2	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
openssh	source	jessie	1:6.7p1-5+deb8u8	DLA-1728-1
openssh	source	stretch	1:7.4p1-10+deb9u5	DSA-4387-1
openssh	source	(unstable)	1:7.9p1-5		919101

Notes

https://github.com/openssh/openssh-portable/commit/6010c0303a422a9c5fa8860c061bf7105eb7f8b2
https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt