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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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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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| | CVE reference: | CVE-2007-0956 (Secunia mirror)
CVE-2007-0957 (Secunia mirror)
CVE-2007-1216 (Secunia mirror)
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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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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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19 Related Secunia Security Advisories, displaying 10
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1. Kerberos Multiple Vulnerabilities
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2. Kerberos Multiple Vulnerabilities
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3. Kerberos Multiple Vulnerabilities
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4. Kerberos kadmind xprt->xp_auth Code Execution Vulnerability
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5. Kerberos kadmind "mechglue" Code Execution Vulnerability
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6. Kerberos V5 setuid Security Issue
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7. Kerberos V5 Multiple Vulnerabilities
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8. Kerberos V5 Telnet Client Information Disclosure Weakness
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9. MIT Kerberos Telnet Client Buffer Overflow Vulnerabilities
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10. Kerberos V5 "libkadm5srv" Buffer Overflow Vulnerability
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