The Q.931 dissector in Ethereal before 0.10.0, and Tethereal, allows remote attackers to cause a denial of service (crash) via a malformed Q.931, which triggers a null dereference.
ftp://patches.sgi.com/support/free/security/advisories/20040103-01-U.asc
ftp://patches.sgi.com/support/free/security/advisories/20040202-01-U.asc
distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000801
secunia.com/advisories/10531
secunia.com/advisories/10568
secunia.com/advisories/10570
www.debian.org/security/2003/dsa-407
www.ethereal.com/appnotes/enpa-sa-00012.html
www.mandriva.com/security/advisories?name=MDKSA-2004:002
www.redhat.com/support/errata/RHSA-2004-001.html
www.redhat.com/support/errata/RHSA-2004-002.html
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10097
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A857