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CVE-2022-28345

7.5 · HIGH

The Signal app before 5.34 for iOS allows URI spoofing via RTLO injection.

Published Apr 15, 2022CWE-74EPSS 2.49%

Overview

CVE-2022-28345 is a high-severity vulnerability. It was published on April 15, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refblog.malwarebytes.com/social-engineering/2022/03/uri-spoofing-flaw-could-phish-whatsapp-signal-instagram-and-imessage-users/GitHubgithub.com/sickcodes/security/blob/master/advisories/SICK-2022-42.mdGitHubgithub.com/zadewg/RIUSRefsick.codes/sick-2022-42Refblog.malwarebytes.com/social-engineering/2022/03/uri-spoofing-flaw-could-phish-whatsapp-signal-instagram-and-imessage-users/GitHubgithub.com/sickcodes/security/blob/master/advisories/SICK-2022-42.mdGitHubgithub.com/zadewg/RIUSRefsick.codes/sick-2022-42

How CyberStrike helps

Frequently asked questions

What is CVE-2022-28345?

CVE-2022-28345 is a high-severity vulnerability. It was published on April 15, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2022-28345?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2022-28345?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-28345?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-28345 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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