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Ubuntu Security Notice USN-3944-1
April 10, 2019

wpa vulnerabilities
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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:
hostapd 2:2.6-18ubuntu1.1
wpasupplicant 2:2.6-18ubuntu1.1

Ubuntu 18.04 LTS:
hostapd 2:2.6-15ubuntu2.2
wpasupplicant 2:2.6-15ubuntu2.2

Ubuntu 16.04 LTS:
hostapd 2.4-0ubuntu6.4
wpasupplicant 2.4-0ubuntu6.4

Ubuntu 14.04 LTS:
hostapd 2.1-0ubuntu1.7
wpasupplicant 2.1-0ubuntu1.7

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

References:
https://usn.ubuntu.com/usn/usn-3944-1
CVE-2016-10743, CVE-2019-9495, CVE-2019-9497, CVE-2019-9498,
CVE-2019-9499

Package Information:
https://launchpad.net/ubuntu/+source/wpa/2:2.6-18ubuntu1.1
https://launchpad.net/ubuntu/+source/wpa/2:2.6-15ubuntu2.2
https://launchpad.net/ubuntu/+source/wpa/2.4-0ubuntu6.4
https://launchpad.net/ubuntu/+source/wpa/2.1-0ubuntu1.7

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