Buffer overflow in MIT Kerberos 5

1) Buffer overflow

EUVDB-ID: #VU33639

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-2698

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote #AU# to execute arbitrary code.

The iakerb_gss_export_sec_context function in lib/gssapi/krb5/iakerb.c in MIT Kerberos 5 (aka krb5) 1.14 pre-release 2015-09-14 improperly accesses a certain pointer, which allows remote authenticated users to cause a denial of service (memory corruption) or possibly have unspecified other impact by interacting with an application that calls the gss_export_sec_context function. NOTE: this vulnerability exists because of an incorrect fix for CVE-2015-2696.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Kerberos 5: 1.14

External links

http://krbdev.mit.edu/rt/Ticket/Display.html?id=8273
http://lists.opensuse.org/opensuse-updates/2015-11/msg00116.html
http://lists.opensuse.org/opensuse-updates/2015-12/msg00124.html
http://www.ubuntu.com/usn/USN-2810-1
http://github.com/krb5/krb5/commit/3db8dfec1ef50ddd78d6ba9503185995876a39fd

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote via the Internet.

Is there known malware, which exploits this vulnerability?

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