Debian DSA-2577-1 : libssh - several vulnerabilities

high Nessus Plugin ID 63125


The remote Debian host is missing a security-related update.


Multiple vulnerabilities were discovered in libssh by Florian Weimer and Xi Wang :

- CVE-2012-4559: multiple double free() flaws
- CVE-2012-4561: multiple invalid free() flaws
- CVE-2012-4562: multiple improper overflow checks

Those could lead to a denial of service by making an SSH client linked to libssh crash, and maybe even arbitrary code execution.


Upgrade the libssh packages.

For the stable distribution (squeeze), these problems have been fixed in version 0.4.5-3+squeeze1.

See Also

Plugin Details

Severity: High

ID: 63125

File Name: debian_DSA-2577.nasl

Version: 1.11

Type: local

Agent: unix

Published: 12/3/2012

Updated: 1/11/2021

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information


Risk Factor: Medium

Score: 5.9


Risk Factor: High

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libssh, cpe:/o:debian:debian_linux:6.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Patch Publication Date: 12/1/2012

Reference Information

CVE: CVE-2012-4559, CVE-2012-4561, CVE-2012-4562, CVE-2012-6063

DSA: 2577