#VU72145 Predictable Exact Value from Previous Values in uClibC-ng - CVE-2022-30295

Vulnerability identifier: #VU72145

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-30295

CWE-ID: CWE-342

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
uClibC-ng
Universal components / Libraries / Libraries used by multiple products

Vendor: uclibc-ng.org

Description

The vulnerability allows a remote attacker to perform DNS cache poisoning.

The vulnerability exists due to software uses predictable DNS transaction IDs. A remote attacker can perform DNS cache poisoning.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

uClibC-ng: 1.0.0 - 1.0.40

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External links
https://www.nozominetworks.com/blog/nozomi-networks-discovers-unpatched-dns-bug-in-popular-c-standard-library-putting-iot-at-risk/
https://www.kb.cert.org/vuls/id/473698

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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