Debian DSA-273-1 : krb4 - Cryptographic weakness

high Nessus Plugin ID 15110

Synopsis

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

Description

A cryptographic weakness in version 4 of the Kerberos protocol allows an attacker to use a chosen-plaintext attack to impersonate any principal in a realm. Additional cryptographic weaknesses in the krb4 implementation permit the use of cut-and-paste attacks to fabricate krb4 tickets for unauthorized client principals if triple-DES keys are used to key krb4 services. These attacks can subvert a site's entire Kerberos authentication infrastructure.

Solution

Upgrade the krb4 packages immediately.

For the stable distribution (woody) this problem has been fixed in version 1.1-8-2.3.

For the old stable distribution (potato) this problem has been fixed in version 1.0-2.3.

See Also

http://www.debian.org/security/2003/dsa-273

Plugin Details

Severity: High

ID: 15110

File Name: debian_DSA-273.nasl

Version: 1.22

Type: local

Agent: unix

Published: 9/29/2004

Updated: 1/4/2021

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

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:krb4, cpe:/o:debian:debian_linux:2.2, cpe:/o:debian:debian_linux:3.0

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

Patch Publication Date: 3/28/2003

Reference Information

CVE: CVE-2003-0138, CVE-2003-0139

CERT: 442569, 623217

DSA: 273