Description
The acc_ctx_cont function in the SPNEGO acceptor in lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) 1.5.x through 1.12.x before 1.12.2 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an empty continuation token at a certain point during a SPNEGO negotiation.
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | krb5 | 1.12.1+dfsg-5 | — |
| Debian 13 | krb5 | 1.12.1+dfsg-5 | — |
| Debian 12 | krb5 | 1.12.1+dfsg-5 | — |
| Debian 7 | krb5 | 1.10.1+dfsg-5+deb7u2 | DSA-3000-1 |
| Debian 6.0 | krb5 | 1.8.3+dfsg-4squeeze8 | DLA-37-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | krb5 | 1.12+dfsg-2ubuntu4.2 | USN-2310-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | krb5 +6 | 1.12.2-14.el7 | RHSA-2015:0439 |
| RHEL 6 | krb5 +6 | 1.10.3-33.el6 | RHSA-2014:1389 |
| RHEL 5 | krb5 +5 | 1.6.1-78.el5 | RHSA-2014:1245 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.15-1.1 | openSUSE-SU-2024:10004-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | krb5-libs +5 | 1.12.2-14.el7 | ELSA-2015-0439 |
Advisories 8
- RHSA-2015:0439 Red Hat Security Advisory: krb5 security, bug fix and enhancement update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2014:1389 Red Hat Security Advisory: krb5 security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2014:1245 Red Hat Security Advisory: krb5 security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-2310-1 krb5 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-37-1 krb5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3000-1 krb5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10004-1 krb5-1.15-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2015-0439 Moderate: krb5 security, bug fix and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 11, 2015
References
- https://github.com/krb5/krb5/commit/a7886f0ed1277c69142b14a2c6629175a6331edc
- https://bugzilla.redhat.com/show_bug.cgi?id=1121877
- https://github.com/krb5/krb5/commit/524688ce87a15fc75f87efc8c039ba4c7d5c197b
- kerberos-cve20144344-dos(95210) vdb-entry
- http://aix.software.ibm.com/aix/efixes/security/nas_advisory1.asc
- RHSA-2015:0439 vendor-advisory
- 60448 third-party-advisory
- http://support.f5.com/kb/en-us/solutions/public/15000/500/sol15561.html
- FEDORA-2014-8189 vendor-advisory
- 61051 third-party-advisory
- DSA-3000 vendor-advisory
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=7970
- MDVSA-2014:165 vendor-advisory
- 69160 vdb-entry
- 109389 vdb-entry
- 1030706 vdb-entry
- 60082 third-party-advisory
- http://advisories.mageia.org/MGASA-2014-0345.html
- 59102 third-party-advisory