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Insecure Library Loading
Moderately critical

Kerberos Multiple Vulnerabilities

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Release Date:  2007-04-04    Views:  15,608

Secunia Advisory SA24740

Where:

From remote

Impact:

Security Bypass, DoS, System access

Solution Status:

Vendor Workaround

Software:

CVE Reference(s):

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).

Further details available to Secunia VIM customers

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

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Kerberos Multiple Vulnerabilities

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