Weak pseudo-random number generator in NetBSD



Published: 2019-11-26
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE ID N/A
CWE ID CWE-338
Exploitation vector Local
Public exploit N/A
Vulnerable software
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NetBSD
Operating systems & Components / Operating system

Vendor NetBSD Foundation, Inc

Security Advisory

This security advisory describes one low risk vulnerability.

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

Risk: Low

CVSSv3: 4.8 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: N/A

CWE-ID: CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Exploit availability: No

Description

The vulnerability allows a local user to predict values of random generator.

The vulnerability exists due to en error in kern.arandom implementation. A local user that can obtain kernel PRNG state used by kern.arandom can predict future outputs of kern.arandom.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NetBSD: 7.1, 7.1.1, 7.1.2, 7.2, 8.0

CPE External links

http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2019-005.txt.asc

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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