USN-4734-1: wpa_supplicant and hostapd vulnerabilities

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• wpa - client support for WPA and WPA2

Details

It was discovered that wpa_supplicant did not properly handle P2P
(Wi-Fi Direct) group information in some situations, leading to a
heap overflow. A physically proximate attacker could use this to cause a
denial of service or possibly execute arbitrary code. (CVE-2021-0326)

It was discovered that hostapd did not properly handle UPnP subscribe
messages in some circumstances. An attacker could use this to cause a
denial of service. (CVE-2020-12695)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.10

• hostapd - 2:2.9-1ubuntu8.1
• wpasupplicant - 2:2.9-1ubuntu8.1

Ubuntu 20.04

• hostapd - 2:2.9-1ubuntu4.2
• wpasupplicant - 2:2.9-1ubuntu4.2

Ubuntu 18.04

• hostapd - 2:2.6-15ubuntu2.7
• wpasupplicant - 2:2.6-15ubuntu2.7

Ubuntu 16.04

• hostapd - 1:2.4-0ubuntu6.7
• wpasupplicant - 2.4-0ubuntu6.7

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

• CVE-2021-0326
• CVE-2020-12695

Related notices

• USN-4734-2
• USN-4494-1
• USN-4722-1