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CVE-2019-13115

Published: 16 July 2019

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.

From the Ubuntu security team

It was discovered that libssh2 incorrectly handled Diffie Hellman key exchange. A remote attacker could possibly use this issue to cause a denial of service or obtain sensitive information.

Priority

Medium

CVSS 3 base score: 8.1

Status

Package Release Status
libssh2
Launchpad, Ubuntu, Debian
bionic Needed

cosmic Ignored
(reached end-of-life)
disco Ignored
(reached end-of-life)
eoan Ignored
(reached end-of-life)
focal Needed

groovy Ignored
(reached end-of-life)
hirsute Not vulnerable
(1.9.0-1)
impish Not vulnerable
(1.9.0-1)
jammy Not vulnerable
(1.9.0-1)
precise Does not exist

trusty Needed

upstream
Released (1.9.0, 1.4.3-4.1+deb8u4)
xenial Ignored
(end of standard support, was needed)