Krb5: mit krb5 kadmind authenticated dos exploiting dereference of null policy name pointers
- Exploited
- No known exploitation
- Fix
- No fix listed
- Who is exposed
- Not reported
- Last modified
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 25/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The Kerberos administration daemon (kadmind) in MIT Kerberos 5 (krb5) contains a flaw in its policy handling that a remote attacker with a valid login can use to crash the service and deny administrative access. The attacker reaches it over the network by sending a policy request with an empty policy name; no user interaction is needed.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
The policy RPC stubs in kadmin/server/server_stubs.c in MIT Kerberos 5 (aka krb5) 1.5.3 and later do not reject a NULL policy name decoded by xdr_nullstring(), which allows remote authenticated users to cause a denial of service (kadmind crash via NULL pointer dereference) by sending a policy request with an empty policy name that reaches authorization checks or logging code.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure3/25Reachable over the network · Unknown: No advisory context yet
- Reach10/20Shipped in major Linux distributions
- Severity6.5/10CVSS 6.5
- No patch5/5No patch listed yet
What would change the score
- Would score about 80 if added to CISA KEV
- Would score about 75 if CISA's SSVC rates exploitation active
- Would score about 44 if advisories confirm default setups are exposed
Timeline
- CVE published
- First seen by cve.now
Affected versions
- krb5
Version range not reported
- krb5
Version range not reported
- krb5
Version range not reported
- krb5
Version range not reported
- krb5
Version range not reported
- krb5
Version range not reported
Evidence 2
- Report
- Link
Corrections
None so far.
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