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Gentoo Linux Security Advisory GLSA 200406-21 |
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http://security.gentoo.org/ |
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Severity: High |
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Title: mit-krb5: Multiple buffer overflows in |
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krb5_aname_to_localname |
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Date: June 29, 2004 |
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Bugs: #52744 |
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ID: 200406-21 |
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Synopsis |
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======== |
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|
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mit-krb5 contains multiple buffer overflows in the function |
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krb5_aname_to_localname(). This could potentially lead to a complete |
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remote system compromise. |
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|
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Background |
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========== |
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|
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mit-krb5 is the free implementation of the Kerberos network |
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authentication protocol by the Massachusetts Institute of Technology. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 app-crypt/mit-krb5 <= 1.3.3 >= 1.3.3-r1 |
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|
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Description |
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=========== |
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|
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The library function krb5_aname_to_localname() contains multiple buffer |
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overflows. This is only exploitable if explicit mapping or rules-based |
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mapping is enabled. These are not enabled as default. |
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|
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With explicit mapping enabled, an attacker must authenticate using a |
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principal name listed in the explicit mapping list. |
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With rules-based mapping enabled, an attacker must first be able to |
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create arbitrary principal names either in the local realm Kerberos |
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realm or in a remote realm from which the local realm's service are |
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reachable by cross-realm authentication. |
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|
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Impact |
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====== |
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|
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An attacker could use these vulnerabilities to execute arbitrary code |
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with the permissions of the user running mit-krb5, which could be the |
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root user. |
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|
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Workaround |
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========== |
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There is no known workaround at this time. All users are encouraged to |
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upgrade to the latest available version. |
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Resolution |
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========== |
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mit-krb5 users should upgrade to the latest version: |
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# emerge sync |
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# emerge -pv ">=app-crypt/mit-krb5-1.3.3-r1" |
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# emerge ">=app-crypt/mit-krb5-1.3.3-r1" |
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|
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References |
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========== |
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|
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[ 1 ] CAN-2004-0523 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0523 |
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[ 2 ] MIT krb5 Security Advisory |
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http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2004-001-an_to_ln.txt |
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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http://security.gentoo.org/glsa/glsa-200406-21.xml |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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License |
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======= |
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Copyright 2004 Gentoo Technologies, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/1.0 |
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