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Ubuntu LinuxOperating system · Canonical

CVE-2006-6143

HIGH · 9.3 CVSS v2.0 Published 2006-12-31
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
The RPC library in Kerberos 5 1.4 through 1.4.4, and 1.5 through 1.5.1, as used in Kerberos administration daemon (kadmind) and other products that use this library, calls an uninitialized function pointer in freed memory, which allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unspecified vectors.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Ubuntu LinuxOperating system
Affected:= 6.06= 6.10
Kerberos 5Application
Affected:= 1.4= 1.4.1= 1.4.2= 1.4.3= 1.4.4= 1.5= 1.5.1

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
M
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:M/Au:N/C:C/I:C/A:C

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch web.mit.edu →
Recommended fix High confidence

Kerberos 5 1.4.5 or later, or 1.5.2 or later; Ubuntu users should upgrade to patched packages via apt

  1. 1. Identify the vulnerable Kerberos 5 installation by checking the version: krb5-config --version or rpm -q krb5-server
  2. 2. For Ubuntu systems (6.06 LTS, 6.10): Run 'apt-get update' followed by 'apt-get install krb5-kdc krb5-admin-server' to obtain patched packages
  3. 3. For source builds: Download Kerberos 1.4.5 or later (or 1.5.2 or later) from http://web.mit.edu/kerberos/dist/
  4. 4. Rebuild and reinstall the Kerberos 5 distribution
  5. 5. Restart the kadmind service: '/etc/init.d/krb5-admin-server restart' or equivalent
  6. 6. Verify the new version is installed: krb5-config --version
Caveat Major version upgrades of Kerberos may require configuration adjustments; ensure kdc.conf and krb5.conf are compatible with the new version

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2006-6143 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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