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Debian DSA-2125-1 : openssl - buffer overflow

high Nessus Plugin ID 50696

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Synopsis

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

Description

A flaw has been found in the OpenSSL TLS server extension code parsing which on affected servers can be exploited in a buffer overrun attack.
This allows an attacker to cause an application crash or potentially to execute arbitrary code.

However, not all OpenSSL based SSL/TLS servers are vulnerable: a server is vulnerable if it is multi-threaded and uses OpenSSL's internal caching mechanism. In particular the Apache HTTP server (which never uses OpenSSL internal caching) and Stunnel (which includes its own workaround) are NOT affected.

Solution

Upgrade the openssl packages.

This upgrade fixes this issue. After the upgrade, any services using the openssl libraries need to be restarted. The checkrestart script from the debian-goodies package or lsof can help to find out which services need to be restarted.

A note to users of the tor packages from the Debian backports or Debian volatile: this openssl update causes problems with some versions of tor. You need to update to tor 0.2.1.26-4~bpo50+1 or 0.2.1.26-1~lennyvolatile2, respectively. The tor package version 0.2.0.35-1~lenny2 from Debian stable is not affected by these problems.

For the stable distribution (lenny), the problem has been fixed in openssl version 0.9.8g-15+lenny9.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=603709

https://www.debian.org/security/2010/dsa-2125

Plugin Details

Severity: High

ID: 50696

File Name: debian_DSA-2125.nasl

Version: 1.15

Type: local

Agent: unix

Published: 11/24/2010

Updated: 1/4/2021

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 6.6

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:openssl, cpe:/o:debian:debian_linux:5.0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/22/2010

Reference Information

CVE: CVE-2010-3864

BID: 44884

DSA: 2125