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CVE-2019-3857

Published: 25 March 2019

An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.

From the Ubuntu Security Team

It was discovered that libssh2 incorrectly handled SSH_MSG_CHANNEL_REQUEST packets. A remote attacker could possibly use this issue to execute arbitrary code.

Priority

Medium

Cvss 3 Severity Score

8.8

Score breakdown

Status

Package Release Status
libssh2
Launchpad, Ubuntu, Debian
trusty
Released (1.4.3-2ubuntu0.2+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
impish Not vulnerable
(1.8.0-2.1)
groovy Not vulnerable
(1.8.0-2.1)
hirsute Not vulnerable
(1.8.0-2.1)
jammy Not vulnerable
(1.8.0-2.1)
kinetic Not vulnerable
(1.8.0-2.1)
xenial
Released (1.5.0-2ubuntu0.1+esm1)
Available with Ubuntu Pro
lunar Not vulnerable
(1.8.0-2.1)
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)
upstream Needs triage

mantic Not vulnerable
(1.8.0-2.1)

Severity score breakdown

Parameter Value
Base score 8.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H