Bug 157104 - CAN-2005-1174 krb5 buffer overflow, heap corruption in KDC (CAN-2005-1175)
CAN-2005-1174 krb5 buffer overflow, heap corruption in KDC (CAN-2005-1175)
Product: Fedora
Classification: Fedora
Component: krb5 (Show other bugs)
All Linux
medium Severity high
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Assigned To: Nalin Dahyabhai
Brian Brock
: Security
Depends On:
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Reported: 2005-05-06 17:06 EDT by Josh Bressers
Modified: 2007-12-18 10:21 EST (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2007-12-18 10:21:31 EST
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Description Josh Bressers 2005-05-06 17:06:48 EDT
+++ This bug was initially created as a clone of Bug #157103 +++

The MIT krb5 Key Distribution Center (KDC) implementation can corrupt
the heap by attempting to free memory at a random address when it
receives a certain unlikely (but valid) request via a TCP connection.
This attempt to free unallocated memory can result in a KDC crash and
consequent denial of service.  [CAN-2005-1174]

Additionally, the same request, when received by the KDC via either
TCP or UDP, can trigger a bug in the krb5 library which results in a
single-byte overflow of a heap buffer.  Additionally, application
servers are vulnerable to a highly improbable attack, provided that
the attacker controls a realm sharing a cross-realm key with the
target realm. [CAN-2005-1175]

An unauthenticated attacker may be able to use these vulnerabilities
to execute arbitrary code on the KDC host, potentially compromising an
entire Kerberos realm.  No exploit code is known to exist at this
time.  Exploitation of these vulnerabilities is believed to be
Comment 1 Josh Bressers 2005-05-06 17:07:34 EDT
FC4 will be out before the embargo on this issue is lifted, we'll have to keep
that in mind.
Comment 2 Josh Bressers 2005-07-07 09:01:32 EDT
According to MIT, in order to exploit CAN-2005-1175 the attacker must control a
realm sharing a cross-realm key with the target realm.  I'm lowering the
severity to "moderate" for that particular issue.
Comment 3 Mark J. Cox 2005-07-12 14:00:07 EDT
public at http://web.mit.edu/kerberos/www/advisories/ removing embargo
Comment 4 Christian Iseli 2007-01-22 06:05:26 EST
This report targets the FC3 or FC4 products, which have now been EOL'd.

Could you please check that it still applies to a current Fedora release, and
either update the target product or close it ?

Comment 5 Tomas Hoger 2007-12-18 10:21:31 EST
Issue was fixed in upstream version 1.4.2.  All current Fedora versions ship
version 1.6+.  Closing.

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