CVE-2022-28345

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 v3.1

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

CVSS v2.0

5.0 MEDIUMAV:N/AC:L/Au:N/C:N/I:P/A:N

EPSS

2.46% chance of exploitation in the next 30 days, 83th percentile

Published

2022-04-15

Updated

2024-08-03

Proof-of-concept exploits (2)

• sickcodes/security/blob/master/advisories/SICK-2022-42.md
• https://sick.codes/sick-2022-42

References

• CVE Record
• NVD entry

Related

• CVE-2020-25507
• CVE-2020-27402
• CVE-2020-27403
• CVE-2021-28918
• CVE-2021-29662
• CVE-2021-29921