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Kerberos Multiple Vulnerabilities
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Secunia Advisory:
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SA29428
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Release Date:
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2008-03-19
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Critical:
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Highly critical
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Impact:
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Exposure of sensitive information
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 Patch
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| Software: | Kerberos 5.x
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| | CVE reference: | CVE-2008-0062 (Secunia mirror)
CVE-2008-0063 (Secunia mirror)
CVE-2008-0947 (Secunia mirror)
CVE-2008-0948 (Secunia mirror)
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Description:
Some vulnerabilities have been reported in Kerberos, which can be exploited by malicious people to disclose potentially sensitive information, cause a DoS (Denial of Service), or potentially compromise a vulnerable system.
1) The problem is that KDC uses a global variable for all incoming krb4 requests, but sets the variable only for certain requests. This can be exploited to crash an affected server, potentially execute arbitrary code, or disclose potentially sensitive memory.
2) An error exists in KDC when sending responses for krb4 requests. This can be exploited to disclose potentially sensitive stack memory via a specially crafted krb4 request.
Successful exploitation of the vulnerabilities requires that krb4 support is enabled in KDC (disabled by default in newer versions).
3) Two errors exist in the Kerberos RPC library when handling open file descriptors. This can be exploited to cause a memory corruption via an overly large number of RPC connections.
Successful exploitation of the vulnerability may allow execution of arbitrary code, but requires that the operating system allows an overly large number of opened file descriptors, and that "FD_SETSIZE" is not defined in the system headers for versions prior to 1.3.
Vulnerabilities #1 and #2 are reported in Kerberos 5 versions 1.6.3 and prior. Vulnerability #3 is reported in Kerberos 5 versions 1.2.2 through 1.3, and versions 1.4 through 1.6.3.
Solution:
Apply vendor patches.
http://web.mit.edu/kerberos/advisories/2008-001-patch.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2008-002.txt
Provided and/or discovered by:
1) Reported by the vendor.
2) The vendor credits Jeff Altman of Secure Endpoints, and Red Hat Security Response Team.
Original Advisory:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2008-001.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2008-002.txt
Other References:
US-CERT VU#895609:
http://www.kb.cert.org/vuls/id/895609
US-CERT VU#374121:
http://www.kb.cert.org/vuls/id/374121
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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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