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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | openssl +2 | 0.9.8e-12.el5_4.6 | RHSA-2010:0162 |
Advisories 1
- RHSA-2010:0162 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
References
- ADV-2010-0916 vdb-entry
- 42724 third-party-advisory
- 39461 third-party-advisory
- oval:org.mitre.oval:def:9856 vdb-entry signature
- https://bugzilla.redhat.com/show_bug.cgi?id=569774
- FEDORA-2010-5357 vendor-advisory
- HPSBUX02531 vendor-advisory
- oval:org.mitre.oval:def:12260 vdb-entry signature
- [oss-security] 20100303 OpenSSL (with KRB5) remote crash - CVE-2010-0433 mailing-list
- [dovecot] 20100219 segfault - (imap|pop3)-login during nessus scan mailing-list
- [syslog-ng-announce] 20110110 syslog-ng Premium Edition 3.0.6a has been released mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=567711
- http://www.vmware.com/support/vsphere4/doc/vsp_vc41_u1_rel_notes.html
- ADV-2010-0839 vdb-entry
- http://cvs.openssl.org/chngview?cn=19374
- MDVSA-2010:076 vendor-advisory
- HPSBUX02517 vendor-advisory
- [syslog-ng-announce] 20110110 syslog-ng Premium Edition 3.2.1a has been released mailing-list
- 39932 third-party-advisory
- http://www.openssl.org/news/changelog.html
- ADV-2010-0933 vdb-entry
- http://www.vmware.com/security/advisories/VMSA-2011-0003.html
- https://kb.bluecoat.com/index?page=content&id=SA50
- 20110211 VMSA-2011-0003 Third party component updates for VMware vCenter Server, vCenter Update Manager, ESXi and ESX mailing-list
- 43311 third-party-advisory
- ADV-2010-1216 vdb-entry
- oval:org.mitre.oval:def:6718 vdb-entry signature
- 42733 third-party-advisory
- FEDORA-2010-5744 vendor-advisory
- http://aix.software.ibm.com/aix/efixes/security/openssl_advisory.asc
- http://groups.google.com/group/mailing.openssl.users/browse_thread/thread/c3e1ab0034ca4b4c/66aa896c3a78b2f7