SB2019052814 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in Revive Adserver

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Main Vulnerability Database SB2019052814

SB2019052814 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in Revive Adserver

Published: May 28, 2019 Updated: July 17, 2020

Security Bulletin ID SB2019052814
Severity
High
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) (CVE-ID: CVE-2019-5440)

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

Use of cryptographically weak PRNG in the password recovery token generation of Revive Adserver < v4.2.1 causes a potential authentication bypass attack if an attacker exploits the password recovery functionality. In lib/OA/Dal/PasswordRecovery.php, the function generateRecoveryId() generates a password reset token that relies on the PHP uniqid function and consequently depends only on the current server time, which is often visible in an HTTP Date header.


Remediation

Install update from vendor's website.

References