Input validation error in web.mit.edu krb5

1) Input validation error

EUVDB-ID: #VU33819

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-2696

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

lib/gssapi/krb5/iakerb.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 IAKERB packet that is mishandled during a gss_inquire_context call.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Kerberos 5: 1.0 - 1.18.2

External links

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/msg00014.html
http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00022.html
http://www.debian.org/security/2015/dsa-3395
http://www.securityfocus.com/bid/90675
http://www.securitytracker.com/id/1034084
http://www.ubuntu.com/usn/USN-2810-1
http://github.com/krb5/krb5/commit/e04f0283516e80d2f93366e0d479d13c9b5c8c2a
http://security.gentoo.org/glsa/201611-14

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.