Published: 21 March 2019
An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.
From the Ubuntu security team
It was discovered that libssh2 incorrectly handled certain specially crafted packets. A remote attacker could possibly use this issue to cause a denial of service or obtain sensitive information.
CVSS 3 base score: 9.1
Launchpad, Ubuntu, Debian
|Ubuntu 21.04 (Hirsute Hippo)||
|Ubuntu 20.04 LTS (Focal Fossa)||
|Ubuntu 18.04 LTS (Bionic Beaver)||
|Ubuntu 16.04 ESM (Xenial Xerus)||
(end of standard support, was needed)
|Ubuntu 14.04 ESM (Trusty Tahr)||
Upstream fix causes regression: https://lists.opensuse.org/opensuse-security-announce/2019-04/msg00102.html Follow up patch: https://github.com/libssh2/libssh2/commit/ca2744483eac4e707084df5fc55cc69d57571dde