Debian DSA-1766-1 : krb5 - several vulnerabilities

critical Nessus Plugin ID 36120
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Synopsis

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

Description

Several vulnerabilities have been found in the MIT reference implementation of Kerberos V5, a system for authenticating users and services on a network. The Common Vulnerabilities and Exposures project identified the following problems :

- CVE-2009-0844 The Apple Product Security team discovered that the SPNEGO GSS-API mechanism suffers of a missing bounds check when reading a network input buffer which results in an invalid read crashing the application or possibly leaking information.

- CVE-2009-0845 Under certain conditions the SPNEGO GSS-API mechanism references a NULL pointer which crashes the application using the library.

- CVE-2009-0847 An incorrect length check inside the ASN.1 decoder of the MIT krb5 implementation allows an unauthenticated remote attacker to crash of the kinit or KDC program.

- CVE-2009-0846 Under certain conditions the the ASN.1 decoder of the MIT krb5 implementation frees an uninitialized pointer which could lead to denial of service and possibly arbitrary code execution.

Solution

Upgrade the krb5 packages.

For the oldstable distribution (etch), this problem has been fixed in version 1.4.4-7etch7.

For the stable distribution (lenny), this problem has been fixed in version 1.6.dfsg.4~beta1-5lenny1.

See Also

https://security-tracker.debian.org/tracker/CVE-2009-0844

https://security-tracker.debian.org/tracker/CVE-2009-0845

https://security-tracker.debian.org/tracker/CVE-2009-0847

https://security-tracker.debian.org/tracker/CVE-2009-0846

https://www.debian.org/security/2009/dsa-1766

Plugin Details

Severity: Critical

ID: 36120

File Name: debian_DSA-1766.nasl

Version: 1.16

Type: local

Agent: unix

Published: 4/9/2009

Updated: 1/4/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: E:ND/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:krb5, cpe:/o:debian:debian_linux:4.0, 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: 4/9/2009

Reference Information

CVE: CVE-2009-0844, CVE-2009-0845, CVE-2009-0846, CVE-2009-0847

BID: 34257, 34408, 34409

DSA: 1766

CWE: 20, 119, 189