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CVE-2019-3859

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.

Notes

AuthorNote
msalvatore
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

Priority

Medium

Cvss 3 Severity Score

9.1

Score breakdown

Status

Package Release Status
libssh2
Launchpad, Ubuntu, Debian
bionic Needed

cosmic Ignored
(end of life)
disco Not vulnerable
(1.8.0-2.1)
eoan Not vulnerable
(1.8.0-2.1)
focal Not vulnerable
(1.8.0-2.1)
groovy Not vulnerable
(1.8.0-2.1)
hirsute Not vulnerable
(1.8.0-2.1)
impish Not vulnerable
(1.8.0-2.1)
jammy Not vulnerable
(1.8.0-2.1)
kinetic Not vulnerable
(1.8.0-2.1)
lunar Not vulnerable
(1.8.0-2.1)
mantic Not vulnerable
(1.8.0-2.1)
noble Not vulnerable
(1.8.0-2.1)
trusty
Released (1.4.3-2ubuntu0.2+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (1.8.0-2.1, 1.8.1)
xenial
Released (1.5.0-2ubuntu0.1+esm1)
Available with Ubuntu Pro
Patches:
upstream: https://github.com/libssh2/libssh2/commit/dc109a7f518757741590bb993c0c8412928ccec2
upstream: https://github.com/libssh2/libssh2/commit/ca2744483eac4e707084df5fc55cc69d57571dde

Severity score breakdown

Parameter Value
Base score 9.1
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H