Home/CVE/The spnego_gss_accept_sec_context function in lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) 1.5 through 1
CVE

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

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.

MEDIUM · CVSS 5 EPSS 0.19309
Schedule remediation
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 5% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
Sigma rules8 YARA rules0
⬡

Weakness Classification

CWE-20Improper Input Validation
▤

Affected Products & Versions

2
mit kerberosall versions
mit kerberos 5all versions
⚠

Public Exploits & PoCs

1
pocsrc.mit.edu · spnego_mech.c?r1=21875&r2=22084src.mit.edu
◈

Sigma Hunt Rules

8
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSuspicious DNS Query Indicating Kerberos Coercion via DNS Object SPN Spoofing - Network
producthighSuspicious Kerberos Ticket Request via PowerShell Script - ScriptBlock
producthighSuspicious DNS Query Indicating Kerberos Coercion via DNS Object SPN Spoofing
producthighAttempts of Kerberos Coercion Via DNS SPN Spoofing
producthighSuspicious Kerberos Ticket Request via CLI
producthighPotential Kerberos Coercion by Spoofing SPNs via DNS Manipulation
▣

Scoring & Timeline

5
MEDIUM · CVSS v2 (legacy) · cve@mitre.org
View on NVD
This CVE predates CVSS v3; the legacy v2 score is shown so triage still has a severity to work with.
v2 Vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Published to NVD27 Mar 2009 · 04:30 PM
⚑

Vendor Advisories

3
suse-csafopenSUSE-SU-2024:10004-1
usnUSN-755-1
rhsaRHSA-2009:0408Important
🔗

References & Sources

43
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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/34347Vendor Advisory
http://secunia.com/advisories/34594
http://secunia.com/advisories/34617
http://secunia.com/advisories/34622
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