Double free vulnerability in the init_ctx_reselect function in the SPNEGO initiator in lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) 1.10.x through 1.12.x before 1.12.2 allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via network traffic that appears to come from an intended acceptor, but specifies a security mechanism different from the one proposed by the initiator.

References

• https://nvd.nist.gov/vuln/detail/CVE-2014-4343
• krb5/krb5@f18ddf5
• https://bugzilla.redhat.com/show_bug.cgi?id=1121876
• https://exchange.xforce.ibmcloud.com/vulnerabilities/95211
• http://advisories.mageia.org/MGASA-2014-0345.html
• http://aix.software.ibm.com/aix/efixes/security/nas_advisory1.asc
• http://krbdev.mit.edu/rt/Ticket/Display.html?id=7969
• http://lists.fedoraproject.org/pipermail/package-announce/2014-August/136360.html
• http://rhn.redhat.com/errata/RHSA-2015-0439.html
• http://secunia.com/advisories/59102
• http://secunia.com/advisories/60082
• http://secunia.com/advisories/60448
• http://secunia.com/advisories/61052
• http://security.gentoo.org/glsa/glsa-201412-53.xml
• http://support.f5.com/kb/en-us/solutions/public/15000/500/sol15553.html
• http://www.debian.org/security/2014/dsa-3000
• http://www.osvdb.org/109390
• http://www.securityfocus.com/bid/69159
• http://www.securitytracker.com/id/1030706