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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.

Published:Mar 13, 2009

Last Modified:Apr 23, 2026

EPS:Mar 27, 2009

EPSS Score:0.19309

CVSS Score:5

Affected Products

Vendor

Product

Action

Vendor

Mit

Product

Kerberos

Mit

Kerberos

Vendor

Mit

Product

Kerberos 5

Mit

Kerberos 5

Vendor

Redhat

Product

Enterprise Linux

Redhat

Enterprise Linux

Exploits

http://src.mit.edu/fisheye/browse/krb5/trunk/src/lib/gssapi/spnego/spnego_mech.c?r1=21875&r2=22084 http://src.mit.edu/fisheye/browse/krb5/trunk/src/lib/gssapi/spnego/spnego_mech.c?r1=21875&r2=22084

Common Weakness Enumeration

CWE-20 Improper Input Validation

CWE-476 NULL Pointer Dereference

Common Attack Pattern Enumeration and Classification (CAPEC)

CAPEC-10 Buffer Overflow via Environment Variables

CAPEC-101 Server Side Include (SSI) Injection

CAPEC-104 Cross Zone Scripting

CAPEC-108 Command Line Execution through SQL Injection

CAPEC-109 Object Relational Mapping Injection

CAPEC-110 SQL Injection through SOAP Parameter Tampering

CAPEC-120 Double Encoding

CAPEC-13 Subverting Environment Variable Values

CAPEC-135 Format String Injection

CAPEC-136 LDAP Injection

CAPEC-14 Client-side Injection-induced Buffer Overflow

CAPEC-153 Input Data Manipulation

CAPEC-182 Flash Injection

CAPEC-209 XSS Using MIME Type Mismatch

CAPEC-22 Exploiting Trust in Client

CAPEC-23 File Content Injection

CAPEC-230 Serialized Data with Nested Payloads

CAPEC-231 Oversized Serialized Data Payloads

CAPEC-24 Filter Failure through Buffer Overflow

CAPEC-250 XML Injection

CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data

CAPEC-267 Leverage Alternate Encoding

CAPEC-28 Fuzzing

CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters

CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies

CAPEC-42 MIME Conversion

CAPEC-43 Exploiting Multiple Input Interpretation Layers

CAPEC-45 Buffer Overflow via Symbolic Links

CAPEC-46 Overflow Variables and Tags

CAPEC-47 Buffer Overflow via Parameter Expansion

CAPEC-473 Signature Spoof

CAPEC-52 Embedding NULL Bytes

CAPEC-53 Postfix, Null Terminate, and Backslash

CAPEC-588 DOM-Based XSS

CAPEC-63 Cross-Site Scripting (XSS)

CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic

CAPEC-664 Server Side Request Forgery

CAPEC-67 String Format Overflow in syslog()

CAPEC-7 Blind SQL Injection

CAPEC-71 Using Unicode Encoding to Bypass Validation Logic

CAPEC-72 URL Encoding

CAPEC-73 User-Controlled Filename

CAPEC-78 Using Escaped Slashes in Alternate Encoding

CAPEC-79 Using Slashes in Alternate Encoding

CAPEC-8 Buffer Overflow in an API Call

CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic

CAPEC-81 Web Server Logs Tampering

CAPEC-83 XPath Injection

CAPEC-85 AJAX Footprinting

CAPEC-88 OS Command Injection

CAPEC-9 Buffer Overflow in Local Command-Line Utilities

Related CVEs

CVE-2018-20217 (CVSS 5.3) — A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker…

CVE-2018-5709 (CVSS 7.5) — An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. There is a variable "dbentry->n_key_data" i…

CVE-2018-5710 (CVSS 6.5) — An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. The pre-defined function "strlen" is gettin…

CVE-2017-11368 (CVSS 6.5) — In MIT Kerberos 5 (aka krb5) 1.7 and later, an authenticated attacker can cause a KDC assertion failure by sen…

CVE-2014-5354 (CVSS 3.5) — plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c in MIT Kerberos 5 (aka krb5) 1.12.x and 1.13.x before 1.13.1, w…

CVE-2014-4342 (CVSS 5) — MIT Kerberos 5 (aka krb5) 1.7.x through 1.12.x before 1.12.2 allows remote attackers to cause a denial of serv…

CVE-2013-6800 (CVSS 4) — An unspecified third-party database module for the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) …

CVE-2011-0282 (CVSS 5) — The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.6.x through 1.9, when an LDAP backend is used…

CVE-2011-0281 (CVSS 5) — The unparse implementation in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.6.x through 1.9…

CVE-2010-1323 (CVSS 3.7) — MIT Kerberos 5 (aka krb5) 1.3.x, 1.4.x, 1.5.x, 1.6.x, 1.7.x, and 1.8.x through 1.8.3 does not properly determi…

References

http://krbdev.mit.edu/rt/Ticket/Display.html?user=guest&pass=guest&id=6402

http://lists.apple.com/archives/security-announce/2009/May/msg00002.html

http://secunia.com/advisories/34347

http://secunia.com/advisories/34594

http://secunia.com/advisories/34617

http://secunia.com/advisories/34622

http://secunia.com/advisories/34628

http://secunia.com/advisories/34630

http://secunia.com/advisories/34637

http://secunia.com/advisories/34640

http://secunia.com/advisories/34734

http://secunia.com/advisories/35074

http://security.gentoo.org/glsa/glsa-200904-09.xml

http://src.mit.edu/fisheye/browse/krb5/trunk/src/lib/gssapi/spnego/spnego_mech.c?r1=21875&r2=22084

http://src.mit.edu/fisheye/changelog/krb5/?cs=22084

http://sunsolve.sun.com/search/document.do?assetkey=1-26-256728-1

http://support.apple.com/kb/HT3549

http://support.avaya.com/elmodocs2/security/ASA-2009-142.htm

http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5047180.html

http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5047181.html

http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-001.txt

http://wiki.rpath.com/Advisories:rPSA-2009-0058

http://wiki.rpath.com/wiki/Advisories:rPSA-2009-0058

http://www-01.ibm.com/support/docview.wss?uid=swg21396120

http://www.kb.cert.org/vuls/id/662091

http://www.mandriva.com/security/advisories?name=MDVSA-2009:082

http://www.redhat.com/support/errata/RHSA-2009-0408.html

http://www.securityfocus.com/archive/1/502526/100/0/threaded

http://www.securityfocus.com/archive/1/502546/100/0/threaded

http://www.securityfocus.com/bid/34257

http://www.securitytracker.com/id?1021867

http://www.ubuntu.com/usn/usn-755-1

http://www.us-cert.gov/cas/techalerts/TA09-133A.html

http://www.vupen.com/english/advisories/2009/0847

http://www.vupen.com/english/advisories/2009/0976

http://www.vupen.com/english/advisories/2009/1057

http://www.vupen.com/english/advisories/2009/1106

http://www.vupen.com/english/advisories/2009/1297

http://www.vupen.com/english/advisories/2009/2248

https://exchange.xforce.ibmcloud.com/vulnerabilities/49448

https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10044

https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6449

https://www.redhat.com/archives/fedora-package-announce/2009-April/msg00205.html

https://www.redhat.com/archives/fedora-package-announce/2009-April/msg00206.html

http://krbdev.mit.edu/rt/Ticket/Display.html?user=guest&pass=guest&id=6402

http://lists.apple.com/archives/security-announce/2009/May/msg00002.html

http://secunia.com/advisories/34347

http://secunia.com/advisories/34594

http://secunia.com/advisories/34617

http://secunia.com/advisories/34622

http://secunia.com/advisories/34628

http://secunia.com/advisories/34630

http://secunia.com/advisories/34637

http://secunia.com/advisories/34640

http://secunia.com/advisories/34734

http://secunia.com/advisories/35074

http://security.gentoo.org/glsa/glsa-200904-09.xml

http://src.mit.edu/fisheye/browse/krb5/trunk/src/lib/gssapi/spnego/spnego_mech.c?r1=21875&r2=22084

http://src.mit.edu/fisheye/changelog/krb5/?cs=22084

http://sunsolve.sun.com/search/document.do?assetkey=1-26-256728-1

http://support.apple.com/kb/HT3549

http://support.avaya.com/elmodocs2/security/ASA-2009-142.htm

http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5047180.html

http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5047181.html

http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-001.txt

http://wiki.rpath.com/Advisories:rPSA-2009-0058

http://wiki.rpath.com/wiki/Advisories:rPSA-2009-0058

http://www-01.ibm.com/support/docview.wss?uid=swg21396120

http://www.kb.cert.org/vuls/id/662091

http://www.mandriva.com/security/advisories?name=MDVSA-2009:082

http://www.redhat.com/support/errata/RHSA-2009-0408.html

http://www.securityfocus.com/archive/1/502526/100/0/threaded

http://www.securityfocus.com/archive/1/502546/100/0/threaded

http://www.securityfocus.com/bid/34257

http://www.securitytracker.com/id?1021867

http://www.ubuntu.com/usn/usn-755-1

http://www.us-cert.gov/cas/techalerts/TA09-133A.html

http://www.vupen.com/english/advisories/2009/0847

http://www.vupen.com/english/advisories/2009/0976

http://www.vupen.com/english/advisories/2009/1057

http://www.vupen.com/english/advisories/2009/1106

http://www.vupen.com/english/advisories/2009/1297

http://www.vupen.com/english/advisories/2009/2248

https://exchange.xforce.ibmcloud.com/vulnerabilities/49448

https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10044

https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6449

https://www.redhat.com/archives/fedora-package-announce/2009-April/msg00205.html

https://www.redhat.com/archives/fedora-package-announce/2009-April/msg00206.html

Common Vulnerability Scoring System

Attack Vector

Network

Adjacent

Local

Physical

Privileges Required

None

Low

High

User Interaction

None

Required

Scope

Unchanged

Changed

Confidentiality

None

Low

High

Integrity

None

Low

High

Availability

None

Low

High