CVE-2019-13115

Name	CVE-2019-13115
Description	In libssh2 before 1.9.0, kex_method_diffie_hellman_group_exchange_sha256_key_exchange in kex.c has an integer overflow that could lead to an out-of-bounds read in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server. This is related to an _libssh2_check_length mistake, and is different from the various issues fixed in 1.8.1, such as CVE-2019-3855.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-1730-3, DLA-2848-1, DLA-3559-1, ELA-99-3
Debian Bugs	932329

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libssh2 (PTS)	jessie, jessie (lts)	1.4.3-4.1+deb8u7	fixed
	stretch (security)	1.7.0-1+deb9u2	fixed
	stretch (lts), stretch	1.7.0-1+deb9u3	fixed
	buster (security), buster, buster (lts)	1.8.0-2.1+deb10u1	fixed
	bullseye	1.9.0-2+deb11u1	fixed
	bookworm	1.10.0-3	fixed
	sid, trixie	1.11.1-1	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
libssh2	source	wheezy	1.4.2-1.1+deb7u7	ELA-99-3
libssh2	source	jessie	1.4.3-4.1+deb8u4	DLA-1730-3
libssh2	source	stretch	1.7.0-1+deb9u2	DLA-2848-1
libssh2	source	buster	1.8.0-2.1+deb10u1	DLA-3559-1
libssh2	source	(unstable)	1.9.0-1		932329

Notes

https://securitylab.github.com/research/libssh2-integer-overflow/
https://github.com/libssh2/libssh2/pull/350
https://github.com/libssh2/libssh2/commit/ff1b155731ff8f790f12d980911d9fd84d0e1598