Insufficient Entropy in hostapd

1) Insufficient Entropy

EUVDB-ID: #VU30346

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-10064

CWE-ID: CWE-331 - Insufficient Entropy

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

hostapd before 2.6, in EAP mode, makes calls to the rand() and random() standard library functions without any preceding srand() or srandom() call, which results in inappropriate use of deterministic values. This was fixed in conjunction with CVE-2016-10743.

Mitigation

Install update from vendor's website.

Vulnerable software versions

hostapd: 2.0 - 2.5

CPE2.3

• cpe:2.3:a:jouni_malinen:hostapd:2.0:*:*:*:*:*:*:*
• cpe:2.3:a:jouni_malinen:hostapd:2.1:*:*:*:*:*:*:*
• cpe:2.3:a:jouni_malinen:hostapd:2.2:*:*:*:*:*:*:*

External links

https://packetstormsecurity.com/files/156573/Hostapd-Insufficient-Entropy.html
https://seclists.org/fulldisclosure/2020/Feb/26
https://www.openwall.com/lists/oss-security/2020/02/27/1
https://www.openwall.com/lists/oss-security/2020/02/27/2
https://lists.debian.org/debian-lts-announce/2020/03/msg00010.html
https://w1.fi/cgit/hostap/commit/?id=98a516eae8260e6fd5c48ddecf8d006285da7389

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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