CVE-2018-15599

Name	CVE-2018-15599
Description	The recv_msg_userauth_request function in svr-auth.c in Dropbear through 2018.76 is prone to a user enumeration vulnerability because username validity affects how fields in SSH_MSG_USERAUTH messages are handled, a similar issue to CVE-2018-15473 in an unrelated codebase.
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)
References	DLA-1476-1
Debian Bugs	906890

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
dropbear (PTS)	bullseye	2020.81-3+deb11u2	fixed
	bullseye (security)	2020.81-3+deb11u3	fixed
	bookworm	2022.83-1+deb12u3	fixed
	forky, sid, trixie	2025.88-2	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
dropbear	source	jessie	2014.65-1+deb8u3	DLA-1476-1
dropbear	source	stretch	2016.74-5+deb9u1
dropbear	source	(unstable)	2018.76-4		906890

http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002108.html
https://hg.ucc.asn.au/dropbear/rev/5d2d1021ca00