Explain CVE-2009-0845
The spnego_gss_accept_sec_context function in lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) 1.5 through 1.6.3, when SPNEGO is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via invalid ContextFlags data in the reqFlags field in a negTokenInit token.
Affected Products: n/a
References: [{'tags': ['x_refsource_MISC'], 'url': 'http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5047181.html'}, {'name': '20090407 MITKRB5-SA-2009-001: multiple vulnerabilities in SPNEGO, ASN.1 decoder [CVE-2009-0844 CVE-2009-0845 CVE-2009-0847]', 'tags': ['mailing-list', 'x_refsource_BUGTRAQ'], 'url': 'http://www.securityfocus.com/archive/1/502526/100/0/threaded'}, {'name': 'VU#662091', 'tags': ['third-party-advisory', 'x_refsource_CERT-VN'], 'url': 'http://www.kb.cert.org/vuls/id/662091'}, {'name': '34257', 'tags': ['vdb-entry', 'x_refsource_BID'], 'url': 'http://www.securityfocus.com/bid/34257'}, {'name': 'ADV-2009-0847', 'tags': ['vdb-entry', 'x_refsource_VUPEN'], 'url': 'http://www.vupen.com/english/advisories/2009/0847'}, {'name': '34347', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/34347'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://support.apple.com/kb/HT3549'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://support.avaya.com/elmodocs2/security/ASA-2009-142.htm'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://src.mit.edu/fisheye/browse/krb5/trunk/src/lib/gssapi/spnego/spnego_mech.c?r1=21875&r2=22084'}, {'name': 'RHSA-2009:0408', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'http://www.redhat.com/support/errata/RHSA-2009-0408.html'}, {'name': '34637', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/34637'}, {'name': '34640', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/34640'}, {'name': '35074', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/35074'}, {'name': 'MDVSA-2009:082', 'tags': ['vendor-advisory', 'x_refsource_MANDRIVA'], 'url': 'http://www.mandriva.com/security/advisories?name=MDVSA-2009:082'}, {'name': '256728', 'tags': ['vendor-advisory', 'x_refsource_SUNALERT'], 'url': 'http://sunsolve.sun.com/search/document.do?assetkey=1-26-256728-1'}, {'name': 'GLSA-200904-09', 'tags': ['vendor-advisory', 'x_refsource_GENTOO'], 'url': 'http://security.gentoo.org/glsa/glsa-200904-09.xml'}, {'tags': ['x_refsource_MISC'], 'url': 'http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5047180.html'}, {'name': 'ADV-2009-0976', 'tags': ['vdb-entry', 'x_refsource_VUPEN'], 'url': 'http://www.vupen.com/english/advisories/2009/0976'}, {'name': 'APPLE-SA-2009-05-12', 'tags': ['vendor-advisory', 'x_refsource_APPLE'], 'url': 'http://lists.apple.com/archives/security-announce/2009/May/msg00002.html'}, {'name': 'USN-755-1', 'tags': ['vendor-advisory', 'x_refsource_UBUNTU'], 'url': 'http://www.ubuntu.com/usn/usn-755-1'}, {'name': '34630', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/34630'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www-01.ibm.com/support/docview.wss?uid=swg21396120'}, {'name': 'ADV-2009-1057', 'tags': ['vdb-entry', 'x_refsource_VUPEN'], 'url': 'http://www.vupen.com/english/advisories/2009/1057'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-001.txt'}, {'name': '34617', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/34617'}, {'name': '34628', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/34628'}, {'name': '34734', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/34734'}, {'name': 'kerberos-spnego-dos(49448)', 'tags': ['vdb-entry', 'x_refsource_XF'], 'url': 'https://exchange.xforce.ibmcloud.com/vulnerabilities/49448'}, {'name': 'oval:org.mitre.oval:def:6449', 'tags': ['vdb-entry', 'signature', 'x_refsource_OVAL'], 'url': 'https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6449'}, {'name': 'ADV-2009-2248', 'tags': ['vdb-entry', 'x_refsource_VUPEN'], 'url': 'http://www.vupen.com/english/advisories/2009/2248'}, {'name': 'TA09-133A', 'tags': ['third-party-advisory', 'x_refsource_CERT'], 'url': 'http://www.us-cert.gov/cas/techalerts/TA09-133A.html'}, {'tags': ['x_refsource_MISC'], 'url': 'http://wiki.rpath.com/wiki/Advisories:rPSA-2009-0058'}, {'name': 'ADV-2009-1297', 'tags': ['vdb-entry', 'x_refsource_VUPEN'], 'url': 'http://www.vupen.com/english/advisories/2009/1297'}, {'name': '34622', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/34622'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://krbdev.mit.edu/rt/Ticket/Display.html?user=guest&pass=guest&id=6402'}, {'name': 'FEDORA-2009-2852', 'tags': ['vendor-advisory', 'x_refsource_FEDORA'], 'url': 'https://www.redhat.com/archives/fedora-package-announce/2009-April/msg00206.html'}, {'name': '1021867', 'tags': ['vdb-entry', 'x_refsource_SECTRACK'], 'url': 'http://www.securitytracker.com/id?1021867'}, {'name': 'FEDORA-2009-2834', 'tags': ['vendor-advisory', 'x_refsource_FEDORA'], 'url': 'https://www.redhat.com/archives/fedora-package-announce/2009-April/msg00205.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://wiki.rpath.com/Advisories:rPSA-2009-0058'}, {'name': 'oval:org.mitre.oval:def:10044', 'tags': ['vdb-entry', 'signature', 'x_refsource_OVAL'], 'url': 'https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10044'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://src.mit.edu/fisheye/changelog/krb5/?cs=22084'}, {'name': '20090407 rPSA-2009-0058-1 krb5 krb5-server krb5-services krb5-test krb5-workstation', 'tags': ['mailing-list', 'x_refsource_BUGTRAQ'], 'url': 'http://www.securityfocus.com/archive/1/502546/100/0/threaded'}, {'name': '34594', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/34594'}, {'name': 'ADV-2009-1106', 'tags': ['vdb-entry', 'x_refsource_VUPEN'], 'url': 'http://www.vupen.com/english/advisories/2009/1106'}]
CVE State: PUBLISHED