The kssl_keytab_is_available function in ssl/kssl.c in OpenSSL before 0.9.8n, when...

Vulnerability Description

The kssl_keytab_is_available function in ssl/kssl.c in OpenSSL before 0.9.8n, when Kerberos is enabled but Kerberos configuration files cannot be opened, does not check a certain return value, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via SSL cipher negotiation, as demonstrated by a chroot installation of Dovecot or stunnel without Kerberos configuration files inside the chroot.

References

• http://www.vupen.com/english/advisories/2010/0916
• http://secunia.com/advisories/42724
• http://secunia.com/advisories/39461
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9856
• https://bugzilla.redhat.com/show_bug.cgi?id=569774
• http://lists.fedoraproject.org/pipermail/package-announce/2010-April/039561.html
• http://marc.info/?l=bugtraq&m=127557640302499&w=2
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12260
• http://www.openwall.com/lists/oss-security/2010/03/03/5
• http://www.mail-archive.com/dovecot%40dovecot.org/msg26224.html
• https://lists.balabit.com/pipermail/syslog-ng-announce/2011-January/000101.html
• https://bugzilla.redhat.com/show_bug.cgi?id=567711
• http://www.vmware.com/support/vsphere4/doc/vsp_vc41_u1_rel_notes.html
• http://www.vupen.com/english/advisories/2010/0839
• http://cvs.openssl.org/chngview?cn=19374
• http://marc.info/?l=bugtraq&m=127557640302499&w=2
• http://www.mandriva.com/security/advisories?name=MDVSA-2010:076
• http://marc.info/?l=bugtraq&m=127128920008563&w=2
• https://lists.balabit.com/pipermail/syslog-ng-announce/2011-January/000102.html
• http://secunia.com/advisories/39932
• http://www.openssl.org/news/changelog.html
• http://www.vupen.com/english/advisories/2010/0933
• http://www.vmware.com/security/advisories/VMSA-2011-0003.html
• http://marc.info/?l=bugtraq&m=127128920008563&w=2
• https://kb.bluecoat.com/index?page=content&id=SA50
• http://www.securityfocus.com/archive/1/516397/100/0/threaded
• http://secunia.com/advisories/43311
• http://www.vupen.com/english/advisories/2010/1216
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6718
• http://secunia.com/advisories/42733
• http://lists.fedoraproject.org/pipermail/package-announce/2010-April/038587.html
• http://aix.software.ibm.com/aix/efixes/security/openssl_advisory.asc
• http://groups.google.com/group/mailing.openssl.users/browse_thread/thread/c3e1ab0034ca4b4c/66aa896c3a78b2f7