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Category:   Application (Security)  >   Kerberos Vendors:   MIT
Kerberos AES and RC4 Integer Underflow May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1023440
SecurityTracker URL:  http://securitytracker.com/id/1023440
CVE Reference:   CVE-2009-4212   (Links to External Site)
Date:  Jan 12 2010
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5-1.3 to 5-1.6.4, 5-1.7
Description:   A vulnerability was reported in Kerberos. A remote user may be able to execute arbitrary code on the target system.

A remote user can send specially crafted ciphertext data to trigger an integer overflow in the AES and RC4 decryption operations of the MIT Kerberos crypto library and potentially execute arbitrary code on the target system. The code will run with the privileges of the target service.

Impact:   A remote user can execute arbitrary code on the target system or cause the target system to crash.
Solution:   The vendor has issued patches.

The upcoming krb5-1.7.1 and krb5-1.6.4 releases will include the fix.

The vendor's advisory is available at:

http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-004.txt

Vendor URL:  http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-004.txt (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jan 12 2010 (Red Hat Issues Fix) Kerberos AES and RC4 Integer Underflow May Let Remote Users Execute Arbitrary Code
Red Hat has issued a fix for Red Hat Enterprise Linux 3, 4, and 5, and Red Hat Enterprise Linux 4.7, 5.2, and 5.3 Extended Update Support.
Jan 13 2010 (Sun Issues Interim Fix) Kerberos AES and RC4 Integer Underflow May Let Remote Users Execute Arbitrary Code
Sun has issued an interim fix for Solaris 10.
May 6 2011 (HP Issues Fix for OpenVMS) Kerberos AES and RC4 Integer Underflow May Let Remote Users Execute Arbitrary Code
HP has issued a fix for OpenVMS.



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