CVE Vulnerabilities

CVE-2021-27913

Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Published: Aug 30, 2021 | Modified: Sep 03, 2021
CVSS 3.x
3.5
LOW
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
CVSS 2.x
3.5 LOW
AV:N/AC:M/Au:S/C:P/I:N/A:N
RedHat/V2
RedHat/V3
Ubuntu

The function mt_rand is used to generate session tokens, this function is cryptographically flawed due to its nature being one pseudorandomness, an attacker can take advantage of the cryptographically insecure nature of this function to enumerate session tokens for accounts that are not under his/her control This issue affects: Mautic Mautic versions prior to 3.3.4; versions prior to 4.0.0.

Weakness

The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG’s algorithm is not cryptographically strong.

Affected Software

Name Vendor Start Version End Version
Mautic Acquia 4.0.0 4.0.0
Mautic Acquia 4.0.0 4.0.0
Mautic Acquia * *
Mautic Acquia 4.0.0 4.0.0

Extended Description

When a non-cryptographic PRNG is used in a cryptographic context, it can expose the cryptography to certain types of attacks. Often a pseudo-random number generator (PRNG) is not designed for cryptography. Sometimes a mediocre source of randomness is sufficient or preferable for algorithms that use random numbers. Weak generators generally take less processing power and/or do not use the precious, finite, entropy sources on a system. While such PRNGs might have very useful features, these same features could be used to break the cryptography.

Potential Mitigations

References