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.
Published 2021-03-19 16:15:13
Updated 2021-03-25 19:35:55
Source GitHub, Inc.
View at NVD,   CVE.org

Products affected by CVE-2021-21387

Exploit prediction scoring system (EPSS) score for CVE-2021-21387

0.11%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 43 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-21387

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.0
MEDIUM AV:N/AC:L/Au:N/C:P/I:N/A:N
10.0
2.9
NIST
7.5
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.9
3.6
NIST
8.1
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
2.8
5.2
GitHub, Inc.

CWE ids for CVE-2021-21387

  • The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors.
    Assigned by: security-advisories@github.com (Primary)
  • The product stores or transmits sensitive data using an encryption scheme that is theoretically sound, but is not strong enough for the level of protection required.
    Assigned by: security-advisories@github.com (Primary)
  • The product does not implement or incorrectly implements one or more security-relevant checks as specified by the design of a standardized algorithm, protocol, or technique.
    Assigned by: security-advisories@github.com (Primary)

References for CVE-2021-21387

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