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Kerberos Multiple Vulnerabilities
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Secunia Advisory:
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SA24740
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Release Date:
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2007-04-04
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Popularity:
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8,043 views
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Critical:
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Moderately critical
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Impact:
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Security Bypass
DoS
System access
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Where:
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From remote
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Solution Status:
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Vendor Workaround
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| Software: | Kerberos 5.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| | CVE reference: | CVE-2007-0956
CVE-2007-0957
CVE-2007-1216
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Description:
Some vulnerabilities have been reported in Kerberos, which can be exploited by malicious users to cause a DoS or compromise a vulnerable system and by malicious people to bypass certain security restrictions.
1) An error exists in the MIT krb5 telnet daemon (telnetd) when processing the username. This can be exploited to log in as an arbitrary user by providing a specially crafted username beginning with "-e".
NOTE: If the telnet daemon is configured to only permit authenticated login, only authenticated users can exploit this vulnerability.
2) A boundary error exists in the "krb5_klog_syslog()" function within the kadm5 library, which is used by KDC, kadmind and probably other third party products. This can be exploited to cause a stack-based buffer overflow via an overly long string.
Successful exploitation allows execution of arbitrary code, but requires valid credentials.
3) A double-free error exists in the "kg_unseal_v1()" function within the MIT krb5 GSS-API library, which is used by kadmind and probably other third-party products. This can potentially be exploited to execute arbitrary code, but requires valid credentials.
The vulnerabilities are reported in version krb5-1.6. Other versions may also be affected.
Solution:
Apply patches (see vendor advisories for details).
http://web.mit.edu/kerberos/advisories/2007-001-patch.txt
http://web.mit.edu/kerberos/advisories/2007-001-patch.txt.asc
http://web.mit.edu/kerberos/advisories/2007-002-patch.txt
http://web.mit.edu/kerberos/advisories/2007-002-patch.txt.asc
http://web.mit.edu/kerberos/advisories/2007-003-patch.txt
http://web.mit.edu/kerberos/advisories/2007-003-patch.txt.asc
Provided and/or discovered by:
1, 3) Reported by the vendor
2) An anonymous person, reported via iDefense Labs
Original Advisory:
Kerberos:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-001-telnetd.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-002-syslog.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-003.txt
iDefense Labs:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=500
Other References:
US-CERT VU#220816:
http://www.kb.cert.org/vuls/id/220816
US-CERT VU#704024:
http://www.kb.cert.org/vuls/id/704024
US-CERT VU#419344:
http://www.kb.cert.org/vuls/id/419344
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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