A vulnerability exists in GnuTLS that may allow a remote attacker to cause a denial of service.
GnuTLS contains a vulnerability in gnults-serv that may result in a denial of service when handling a specially crafted Client Hello message. According to CERT-FI Vulnerability Advisory on GnuTLS:
The problem occurs when gnutls-serv receives Client Hello message which contains Server name extension where the length of the server name list is set to 18 and the data of the server name list consists of 18 zero octets. After receiving this Client Hello message gnutls-serv continues to function normally, but crashes after Finished messages when it tries to pack the session data in function pack_security_parameters() (in lib/gnutls_session_pack.c).
Note that this issue may affect GnuTLS versions prior to 2.2.5 and also affects version 2.3.0.
A remote, unauthorized attacker may be able to cause a denial of service.
Upgrade or Apply Patch
This issue was reported in GnuTLS Security Advisory SA-2008-01. GnuTLS credits Ossi Herrala and Jukka Taimisto from the CROSS project at Codenomicon Ltd. for reporting this issue.
This document was written by Chris Taschner.
|Date First Published:||2008-05-29|
|Date Last Updated:||2008-05-29 15:46 UTC|