#VU59106 Input validation error in wpa_supplicant - CVE-2021-30004

Vulnerability identifier: #VU59106

Vulnerability risk: Medium

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

CVE-ID: CVE-2021-30004

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
wpa_supplicant
Server applications / Encryption software

Vendor: Jouni Malinen

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to insufficient validation of user-supplied input in tls/pkcs1.c and tls/x509v3.c files in wpa_supplicant and hostapd when handling AlgorithmIdentifier parameters. A remote attacker can pass specially crafted input to the application and perform MitM attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

wpa_supplicant: 2.0 - 2.9

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External links
https://w1.fi/cgit/hostap/commit/?id=a0541334a6394f8237a4393b7372693cd7e96f15

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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.