Information disclosure in Signal chat app



Published: 2021-01-20
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID N/A
CWE-ID CWE-345
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe
Signal
Mobile applications / Apps for mobile phones

Vendor

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Insufficient verification of data authenticity

EUVDB-ID: #VU49847

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to the way the mobile application implements WebRTC features for voice and video communications. A remote attacker can send specially crafted SDP messages to the affected device while the victim is trying to make a voice or video call and intercept video and audio fragments from the victim's phone before the call is accepted by the callee.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Signal: before 4.48.7

External links

http://www.bleepingcomputer.com/news/security/bugs-in-signal-facebook-google-chat-apps-let-attackers-spy-on-users/
http://googleprojectzero.blogspot.com/2021/01/the-state-of-state-machines.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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