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Gentoo Linux Security Advisory GLSA 200803-31 |
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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: March 24, 2008 |
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Bugs: #199205, #212363 |
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ID: 200803-31 |
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Synopsis |
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======== |
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|
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Multiple vulnerabilites have been found in MIT Kerberos 5, which could |
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allow a remote unauthenticated user to execute arbitrary code with root |
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privileges. |
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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 a suite of applications that implement the Kerberos |
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network protocol. kadmind is the MIT Kerberos 5 administration daemon, |
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KDC is the Key Distribution Center. |
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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 < 1.6.3-r1 >= 1.6.3-r1 |
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Description |
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=========== |
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|
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* Two vulnerabilities were found in the Kerberos 4 support in KDC: A |
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global variable is not set for some incoming message types, leading |
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to a NULL pointer dereference or a double free() (CVE-2008-0062) and |
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unused portions of a buffer are not properly cleared when generating |
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an error message, which results in stack content being contained in a |
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reply (CVE-2008-0063). |
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|
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* Jeff Altman (Secure Endpoints) discovered a buffer overflow in the |
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RPC library server code, used in the kadmin server, caused when too |
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many file descriptors are opened (CVE-2008-0947). |
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|
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* Venustech AD-LAB discovered multiple vulnerabilities in the GSSAPI |
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library: usage of a freed variable in the gss_indicate_mechs() |
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function (CVE-2007-5901) and a double free() vulnerability in the |
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gss_krb5int_make_seal_token_v3() function (CVE-2007-5971). |
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|
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Impact |
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====== |
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|
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The first two vulnerabilities can be exploited by a remote |
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unauthenticated attacker to execute arbitrary code on the host running |
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krb5kdc, compromise the Kerberos key database or cause a Denial of |
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Service. These bugs can only be triggered when Kerberos 4 support is |
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enabled. |
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|
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The RPC related vulnerability can be exploited by a remote |
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unauthenticated attacker to crash kadmind, and theoretically execute |
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arbitrary code with root privileges or cause database corruption. This |
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bug can only be triggered in configurations that allow large numbers of |
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open file descriptors in a process. |
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The GSSAPI vulnerabilities could be exploited by a remote attacker to |
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cause Denial of Service conditions or possibly execute arbitrary code. |
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Workaround |
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========== |
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Kerberos 4 support can be disabled via disabling the "krb4" USE flag |
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and recompiling the ebuild, or setting "v4_mode=none" in the |
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[kdcdefaults] section of /etc/krb5/kdc.conf. This will only work around |
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the KDC related vulnerabilities. |
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Resolution |
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========== |
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All MIT Kerberos 5 users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.6.3-r1" |
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|
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References |
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========== |
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[ 1 ] CVE-2007-5901 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5894 |
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[ 2 ] CVE-2007-5971 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5971 |
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[ 3 ] CVE-2008-0062 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0062 |
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[ 4 ] CVE-2008-0063 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0063 |
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[ 5 ] CVE-2008-0947 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0947 |
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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-200803-31.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 2008 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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http://creativecommons.org/licenses/by-sa/2.5 |
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