Vulnerability in Revive Adserver
CVE-2019-5440
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.016 (75.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000
Affected products
- Revive Adserver — versions Fixed in 4.2.1
- Revive-Adserver Revive Adserver
Weakness classification (CWE)
References
- hackerone.com/reports/576504 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-5440?
- CVE-2019-5440 is a high-severity vulnerability in Revive Adserver, classified under Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG). CVSS score: 8.1/10. Published 2019-05-28.
- How severe is CVE-2019-5440?
- High severity. CVSS v3 base score is 8.1 out of 10.