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Gentoo Linux Security Advisory GLSA 200507-11 |
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http://security.gentoo.org/ |
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Severity: High |
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Title: MIT Kerberos 5: Multiple vulnerabilities |
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Date: July 12, 2005 |
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Bugs: #98799 |
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ID: 200507-11 |
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Synopsis |
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======== |
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|
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MIT Kerberos 5 is vulnerable to a Denial of Service attack and remote |
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execution of arbitrary code, possibly leading to the compromise of the |
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entire Kerberos realm. |
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|
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Background |
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========== |
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|
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MIT Kerberos 5 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 < 1.4.1-r1 >= 1.4.1-r1 |
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|
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Description |
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=========== |
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|
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Daniel Wachdorf discovered that MIT Kerberos 5 could corrupt the heap |
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by freeing unallocated memory when receiving a special TCP request |
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(CAN-2005-1174). He also discovered that the same request could lead to |
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a single-byte heap overflow (CAN-2005-1175). Magnus Hagander discovered |
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that krb5_recvauth() function of MIT Kerberos 5 might try to |
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double-free memory (CAN-2005-1689). |
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|
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Impact |
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====== |
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|
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Although exploitation is considered difficult, a remote attacker could |
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exploit the single-byte heap overflow and the double-free vulnerability |
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to execute arbitrary code, which could lead to the compromise of the |
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whole Kerberos realm. A remote attacker could also use the heap |
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corruption to cause a Denial of Service. |
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|
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Workaround |
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========== |
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There are no known workarounds at this time. |
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Resolution |
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========== |
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All MIT Kerberos 5 users should upgrade to the latest available |
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version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.4.1-r1" |
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|
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References |
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========== |
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[ 1 ] CAN-2005-1174 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1174 |
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[ 2 ] CAN-2005-1175 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1175 |
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[ 3 ] CAN-2005-1689 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1689 |
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[ 4 ] MITKRB5-SA-2005-002 |
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http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2005-002-kdc.txt |
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[ 5 ] MITKRB5-SA-2005-003 |
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http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2005-003-recvauth.txt |
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|
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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-200507-11.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 2005 Gentoo Foundation, 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/2.0 |
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