CVE-2021-21387 Partial secret key disclosure, improper safety number calculation, & inadequate encryption strength
Attackers can exploit weak encryption and key disclosure flaws in the wrongthink messenger to compromise communication security.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-21387?
CVE-2021-21387 is a high-severity vulnerability in parabirb wrongthink, published on 19 Mar 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Wrongthink peer-to-peer, end-to-end encrypted messenger with PeerJS and Axolotl ratchet. In wrongthink from version 2.0.0 and before 2.3.0 there was a set of vulnerabilities causing inadequate encryption strength. Part of the secret identity key was disclosed by the fingerprint used for connection. Additionally, the safety number was improperly calculated. It was computed using part of one of the public identity keys instead of being derived from both public identity keys. This caused issues in computing safety numbers which would potentially be exploitable in the real world. Additionally there was inadequate encryption strength due to use of 1024-bit DSA keys. These issues are all fixed in version 2.3.0.
Which versions are affected by CVE-2021-21387?
It affects 1 product.
Products include Wrongthink Wrongthink.
How do I fix CVE-2021-21387?
No fix has been published for CVE-2021-21387 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-21387 being exploited?
There is no known exploitation of CVE-2021-21387 in the wild and no public exploit code.