Advisory Published

USN-3944-1: wpa_supplicant and hostapd vulnerabilities

First published: Wed Apr 10 2019(Updated: )

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)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/hostapd<2:2.6-18ubuntu1.1
2:2.6-18ubuntu1.1
=18.10
All of
ubuntu/wpasupplicant<2:2.6-18ubuntu1.1
2:2.6-18ubuntu1.1
=18.10
All of
ubuntu/hostapd<2:2.6-15ubuntu2.2
2:2.6-15ubuntu2.2
=18.04
All of
ubuntu/wpasupplicant<2:2.6-15ubuntu2.2
2:2.6-15ubuntu2.2
=18.04
All of
ubuntu/hostapd<1:2.4-0ubuntu6.4
1:2.4-0ubuntu6.4
=16.04
All of
ubuntu/wpasupplicant<2.4-0ubuntu6.4
2.4-0ubuntu6.4
=16.04
All of
ubuntu/hostapd<1:2.1-0ubuntu1.7
1:2.1-0ubuntu1.7
=14.04
All of
ubuntu/wpasupplicant<2.1-0ubuntu1.7
2.1-0ubuntu1.7
=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this security advisory?

    The vulnerability ID for this security advisory is USN-3944-1.

  • What is the severity of USN-3944-1?

    The severity of USN-3944-1 is not mentioned in the description.

  • What is the affected software for USN-3944-1?

    The affected software for USN-3944-1 are wpa_supplicant and hostapd.

  • What is the impact of USN-3944-1?

    The impact of USN-3944-1 is that a remote attacker could possibly use a side channel attack against EAP-pwd to recover certain passwords.

  • How do I fix the vulnerability for USN-3944-1?

    To fix the vulnerability for USN-3944-1, update the affected software to the recommended version provided by the vendor.

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