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[ GLSA 200507-11 ] MIT Kerberos 5: Multiple vulnerabilities
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GLSA
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Joined: 12 May 2004
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PostPosted: Tue Jul 12, 2005 7:30 pm    Post subject: [ GLSA 200507-11 ] MIT Kerberos 5: Multiple vulnerabilities Reply with quote

Gentoo Linux Security Advisory

Title: MIT Kerberos 5: Multiple vulnerabilities (GLSA 200507-11)
Severity: high
Exploitable: remote
Date: July 12, 2005
Bug(s): #98799
ID: 200507-11

Synopsis


MIT Kerberos 5 is vulnerable to a Denial of Service attack and remote
execution of arbitrary code, possibly leading to the compromise of the
entire Kerberos realm.


Background


MIT Kerberos 5 is the free implementation of the Kerberos network
authentication protocol by the Massachusetts Institute of Technology.


Affected Packages

Package: app-crypt/mit-krb5
Vulnerable: < 1.4.1-r1
Unaffected: >= 1.4.1-r1
Architectures: All supported architectures


Description


Daniel Wachdorf discovered that MIT Kerberos 5 could corrupt the
heap by freeing unallocated memory when receiving a special TCP request
(CAN-2005-1174). He also discovered that the same request could lead to
a single-byte heap overflow (CAN-2005-1175). Magnus Hagander discovered
that krb5_recvauth() function of MIT Kerberos 5 might try to
double-free memory (CAN-2005-1689).


Impact


Although exploitation is considered difficult, a remote attacker
could exploit the single-byte heap overflow and the double-free
vulnerability to execute arbitrary code, which could lead to the
compromise of the whole Kerberos realm. A remote attacker could also
use the heap corruption to cause a Denial of Service.


Workaround


There are no known workarounds at this time.


Resolution


All MIT Kerberos 5 users should upgrade to the latest available
version:
Code:
# emerge --sync
    # emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.4.1-r1"


References

CAN-2005-1174
CAN-2005-1175
CAN-2005-1689
MITKRB5-SA-2005-002
MITKRB5-SA-2005-003


Last edited by GLSA on Mon Mar 03, 2014 4:20 am; edited 3 times in total
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