CVE-2021-27913 – mautic/core

Package

Manager: composer
Name: mautic/core
Vulnerable Version: >=0 <3.3.4 || >=4.0.0-alpha1 <4.0.0

Severity

Level: Low

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L

CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

EPSS: 0.00089 pctl0.26223

Details

Use of a Broken or Risky Cryptographic Algorithm ## ✍️ Description 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 ## 🕵️‍♂️ Proof of Concept Numerous examples and attack implementations can be found in this paper . If you're looking for a practical tool that can crack your mt_rand implementation's seed value, see this project and run the following commands in a console with php5 and OpenWall's tool installed: `root$ php -r 'mt_srand(13333337); echo mt_rand( ), "\n";'` After that, copy the output (1863134308) and execute the following commands: `root$ gcc php_mt_seed.c -o php_mt_seedroot$ ./php_mt_seed 1863134308` After waiting ~1 minute you should have a few possible seeds corresponding to their PHP versions, next to your installed PHP version you should see something akin to: seed = 0x00cb7359 = 13333337 (PHP 7.1.0+) Hey, that's your seed! ## 💥 Impact An attacker could takeover accounts at random by enumerating and using access tokens. ## 📝 References - https://openwall.com/php_mt_seedhttps://crypto.di.uoa.gr/CRYPTO.SEC/Randomness_Attacks_files/paper.pdf - https://github.com/mautic/mautic/blob/5213e320b4ef4d0c51bb84c1d46a1071e8e4f7fc/app/bundles/PointBundle/Controller/TriggerController.php#L187 - https://github.com/mautic/mautic/releases/tag/3.3.4 - https://github.com/mautic/mautic/releases/tag/4.0.0

Metadata

Created: 2021-09-01T18:41:06Z
Modified: 2024-02-05T15:50:17Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/09/GHSA-x7g2-wrrp-r6h3/GHSA-x7g2-wrrp-r6h3.json
CWE IDs: ["CWE-327"]
Alternative ID: GHSA-x7g2-wrrp-r6h3
Finding: F052
Auto approve: 1