Debian DSA-3395-1 : krb5 - security update

high Nessus Plugin ID 86795
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Synopsis

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

Description

Several vulnerabilities were discovered in krb5, the MIT implementation of Kerberos. The Common Vulnerabilities and Exposures project identifies the following problems :

- CVE-2015-2695 It was discovered that applications which call gss_inquire_context() on a partially-established SPNEGO context can cause the GSS-API library to read from a pointer using the wrong type, leading to a process crash.

- CVE-2015-2696 It was discovered that applications which call gss_inquire_context() on a partially-established IAKERB context can cause the GSS-API library to read from a pointer using the wrong type, leading to a process crash.

- CVE-2015-2697 It was discovered that the build_principal_va() function incorrectly handles input strings. An authenticated attacker can take advantage of this flaw to cause a KDC to crash using a TGS request with a large realm field beginning with a null byte.

Solution

Upgrade the krb5 packages.

For the oldstable distribution (wheezy), these problems have been fixed in version 1.10.1+dfsg-5+deb7u4.

For the stable distribution (jessie), these problems have been fixed in version 1.12.1+dfsg-19+deb8u1.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=803083

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=803084

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=803088

https://security-tracker.debian.org/tracker/CVE-2015-2695

https://security-tracker.debian.org/tracker/CVE-2015-2696

https://security-tracker.debian.org/tracker/CVE-2015-2697

https://packages.debian.org/source/wheezy/krb5

https://packages.debian.org/source/jessie/krb5

https://www.debian.org/security/2015/dsa-3395

Plugin Details

Severity: High

ID: 86795

File Name: debian_DSA-3395.nasl

Version: 2.7

Type: local

Agent: unix

Published: 11/9/2015

Updated: 1/11/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:krb5, cpe:/o:debian:debian_linux:7.0, cpe:/o:debian:debian_linux:8.0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/6/2015

Reference Information

CVE: CVE-2015-2695, CVE-2015-2696, CVE-2015-2697

DSA: 3395