CVE-2022-28345 Information

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

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

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.5