CVE-2015-2695

lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) before 1.14 relies on an inappropriate context handle, which allows remote attackers to cause a denial of service (incorrect pointer read and process crash) via a crafted SPNEGO packet that is mishandled during a gss_inquire_context call.

Weakness

The product attempts to return a memory resource to the system, but it calls the wrong release function or calls the appropriate release function incorrectly.

Affected Software

Extended Description

This weakness can take several forms, such as:

Potential Mitigations

• Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
• For example, glibc in Linux provides protection against free of invalid pointers.

References

• http://krbdev.mit.edu/rt/Ticket/Display.html?id=8244
• http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00006.html
• http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00007.html
• http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00014.html
• http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00022.html
• http://www.debian.org/security/2015/dsa-3395
• http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
• http://www.securityfocus.com/bid/90687
• http://www.securitytracker.com/id/1034084
• http://www.ubuntu.com/usn/USN-2810-1
• https://github.com/krb5/krb5/commit/b51b33f2bc5d1497ddf5bd107f791c101695000d
• https://security.gentoo.org/glsa/201611-14