4875 : MIT Kerberos 4/5 e_msg Variable kerb_err_reply Function Remote Overflow
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Info

Last Modified
6 months ago

Percent Complete
100%

Disclosure
Jun 09, 2000

Discovery
Jun 09, 2000

Dates

Exploit
Unknown

Solution
Unknown

Description

 MIT Kerberos contain a flaw that may allow a remote denial of service. The issue is triggered when a remote attacker overflows the buffer of the e_msg variable in the kerb_err_reply() function, causing the KDC to issue invalid tickets for all principles, generate a "principal unknown" error or crash the KDC process, resulting in loss of availability for the platform.

Classification

 Location: Remote/Network Access Required
Attack Type: Denial of Service, Input Manipulation
Impact: Loss of Availability
Exploit: Exploit Unavailable
Disclosure: OSVDB Verified

Solution

 Upgrade to MIT Kerberos 5 version 1.2 or higher, as it has been reported to fix this vulnerability. It is also possible to correct the flaw by implementing the following workaround: apply the appropriate KDC patch from MIT, as listed in the Kerberos Security Advisory.

Products
Cygnus
Watch-list
KerbNet
Watch-list
 All Versions
Network Security
Watch-list
 All Versions
MIT
Watch-list
Kerberos
Watch-list
 4.0 patch 10
krb5-1.0.x
krb5-1.1
krb5-1.1.1

References

Credit
  • Matt Power - mhpowerBrand New Doo Doomit.edu - Massachusettes Institute of Technology
  • Assar Westerlund - assarBrand New Doo Doosics.se - Swedish Institute of Computer Science
  • Nalin Dahyabhai - nalinBrand New Doo Dooredhat.com - Red Hat, Inc.
  • Andrew Newman - newmanBrand New Doo Dooyale.edu - Yale University

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