SB2019050925 - Weak pseudo-random number generator in Matrix Sydent and Synapse
Published: May 9, 2019 Updated: May 17, 2023
Security Bulletin ID
SB2019050925
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) (CVE-ID: CVE-2019-11842)
CWE-ID: CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to gain unauthorized access to the application.
The vulnerability exists due to usage of a weak algorithm to generate a Sydent authentication token or a Synapse random ID. A remote attacker can brute-force the token and gain unauthorized access to the application.
Remediation
Install update from vendor's website.