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

Severity

68%

Complexity

86%

Confidentiality

106%

CVSS 3.0 Base Score 8.1. CVSS Attack Vector: network. CVSS Attack Complexity: high. CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 6.8. CVSS Attack Vector: network. CVSS Attack Complexity: medium. CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:P/A:P).

Demo Examples

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

CWE-338

Both of these examples use a statistical PRNG to generate a random number:


               int accountID = random.nextInt();


               int randNum = rand();

The random number functions used in these examples, rand() and Random.nextInt(), are not considered cryptographically strong. An attacker may be able to predict the random numbers generated by these functions. Note that these example also exhibit CWE-337 (Predictable Seed in PRNG).

Overview

First reported 5 years ago

2019-05-28 19:29:00

Last updated 5 years ago

2019-10-09 23:50:00

Affected Software

Revive-adserver Revive Adserver

References

https://hackerone.com/reports/576504

Exploit, Third Party Advisory

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