5 - USN-126-1

Executive Summary

Summary
Title	GNU TLS library vulnerability

Informations
Name	USN-126-1	First vendor Publication	2005-05-13
Vendor	Ubuntu	Last vendor Modification	2005-05-13
Severity (Vendor)	N/A	Revision	N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:N/A:P)
Cvss Base Score	5	Attack Range	Network
Cvss Impact Score	2.9	Attack Complexity	Low
Cvss Expoit Score	10	Authentication	None Required
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Detail

A security issue affects the following Ubuntu releases:

Ubuntu 4.10 (Warty Warthog) Ubuntu 5.04 (Hoary Hedgehog)

The following packages are affected:

libgnutls10 libgnutls11 libgnutls11-dbg

The problem can be corrected by upgrading the affected package to version 1.0.4-3ubuntu1.1 (for Ubuntu 4.10), or 1.0.16-13ubuntu0.1 (for Ubuntu 5.04). For most desktop applications, a standard system upgrade is sufficient to effect the necessary changes. However, if you are using server and long running applications that use libgnutls (cupsys, exim4, Gaim), you must restart them manually. If you can afford to reboot your machine, this is the easiest way to ensure that all services using this library are restarted correctly.

Details follow:

A Denial of Service vulnerability was discovered in the GNU TLS library, which provides common cryptographic algorithms and is used by many applications in Ubuntu. Due to a missing sanity check of the padding length field, specially crafted ciphertext blocks caused an out of bounds memory access which could crash the application. It was not possible to exploit this to execute any attacker specified code.