Home / Security / USN-3944-1: wpa_supplicant and hostapd vulnerabilities

USN-3944-1: wpa_supplicant and hostapd vulnerabilities

10 April 2019

wpa vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 18.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in wpa_supplicant and hostapd.

Software Description

  • wpa – client support for WPA and WPA2

Details

It was discovered that wpa_supplicant and hostapd were vulnerable to a
side channel attack against EAP-pwd. A remote attacker could possibly use
this issue to recover certain passwords. (CVE-2019-9495)

Mathy Vanhoef discovered that wpa_supplicant and hostapd incorrectly
validated received scalar and element values in EAP-pwd-Commit messages. A
remote attacker could possibly use this issue to perform a reflection
attack and authenticate without the appropriate password. (CVE-2019-9497,
CVE-2019-9498, CVE-2019-9499)

It was discovered that hostapd incorrectly handled obtaining random
numbers. In rare cases where the urandom device isn’t available, it would
fall back to using a low-quality PRNG. This issue only affected Ubuntu
14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-10743)

Update instructions

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

Ubuntu 18.10
hostapd2:2.6-18ubuntu1.1
wpasupplicant2:2.6-18ubuntu1.1
Ubuntu 18.04 LTS
hostapd2:2.6-15ubuntu2.2
wpasupplicant2:2.6-15ubuntu2.2
Ubuntu 16.04 LTS
hostapd2.4-0ubuntu6.4
wpasupplicant2.4-0ubuntu6.4
Ubuntu 14.04 LTS
hostapd2.1-0ubuntu1.7
wpasupplicant2.1-0ubuntu1.7

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

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