Vulnerability in Signal
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.025 (84.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: +0.000
Affected products
Weakness classification (CWE)
References
- github.com/zadewg/RIUS (Third Party Advisory)
- sick.codes/sick-2022-42 (Exploit, Patch, Third Party Advisory)
- github.com/sickcodes/security/blob/master/advisories/SICK-2022-42.md (Exploit, Patch, Third Party Advisory)
- blog.malwarebytes.com/social-engineering/2022/03/uri-spoofing-flaw-could-phish-… (Third Party Advisory)
Frequently asked questions
- What is CVE-2022-28345?
- CVE-2022-28345 is a high-severity vulnerability in Signal, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.5/10. Published 2022-04-15.
- How severe is CVE-2022-28345?
- High severity. CVSS v3 base score is 7.5 out of 10.