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Category:   Application (Security)  >   Kerberos Vendors:   MIT
MIT Kerberos Multiple Bugs Let Remote Users Cause the Target Service to Crash
SecurityTracker Alert ID:  1034084
SecurityTracker URL:  http://securitytracker.com/id/1034084
CVE Reference:   CVE-2015-2695, CVE-2015-2696, CVE-2015-2697, CVE-2015-2698   (Links to External Site)
Updated:  Nov 13 2015
Original Entry Date:  Nov 5 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5-1.5 and later
Description:   Three vulnerabilities were reported in MIT Kerberos. A remote or remote authenticated user can cause the target service to crash.

A remote user can make a specially crafted gss_inquire_context() call on a partially-established SPNEGO context to trigger a pointer type error in the GSS-API library and cause a process crash [CVE-2015-2695].

A remote user can make a specially crafted gss_inquire_context() on a partially-established IAKERB context can trigger a pointer type error in the the GSS-API library and cause a process crash [CVE-2015-2696]. Versions 5-1.9 and later are affected.

A remote authenticated user can send a TGS request with a specially crafted realm field beginning with a null byte to cause the target KDC to crash [CVE-2015-2697]. Versions 5-1.7 and later are affected.

Impact:   A remote or remote authenticated user can cause the target service to crash.
Solution:   The vendor has issued a source code fix, available at:

https://github.com/krb5/krb5/commit/31fb730f1ad708f230e4387e02ed2f89b93c3607
https://github.com/krb5/krb5/commit/e04f0283516e80d2f93366e0d479d13c9b5c8c2a
https://github.com/krb5/krb5/commit/f0c094a1b745d91ef2f9a4eae2149aac026a5789

[Editor's note: The original fix for CVE-2015-2696 was incomplete. The incomplete fix has been assigned CVE-2015-2698.]

The new fix is available at:

https://github.com/krb5/krb5/commit/54222de30a89bfac0247dfbc1759556dc9fd2983

The vendor's advisories are available at:

http://krbdev.mit.edu/rt/Ticket/Display.html?id=8244
http://krbdev.mit.edu/rt/Ticket/Display.html?id=8252
http://krbdev.mit.edu/rt/Ticket/Display.html?id=8273

Vendor URL:  krbdev.mit.edu/rt/Ticket/Display.html?id=8244 (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Nov 13 2015 (Ubuntu Issues Fix) MIT Kerberos Multiple Bugs Let Remote Users Cause the Target Service to Crash
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS, 14.04 LTS, 15.04, and 15.10.



 Source Message Contents



[Original Message Not Available for Viewing]


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