Debian Security Advisory DSA 4430-1 (wpa - security update)

Published: 2019-04-13 02:00:11
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:N/C:C/I:C/A:C

Summary:
The remote host is missing an update for the 'wpa' Linux Distribution Package(s) announced via the DSA-4430-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
Mathy Vanhoef (NYUAD) and Eyal Ronen (Tel Aviv University & KU Leuven) found multiple vulnerabilities in the WPA implementation found in wpa_supplication (station) and hostapd (access point). These vulnerability are also collectively known as Dragonblood . CVE-2019-9495 Cache-based side-channel attack against the EAP-pwd implementation: an attacker able to run unprivileged code on the target machine (including for example javascript code in a browser on a smartphone) during the handshake could deduce enough information to discover the password in a dictionary attack. CVE-2019-9497 Reflection attack against EAP-pwd server implementation: a lack of validation of received scalar and elements value in the EAP-pwd-Commit messages could result in attacks that would be able to complete EAP-pwd authentication exchange without the attacker having to know the password. This does not result in the attacker being able to derive the session key, complete the following key exchange and access the network. CVE-2019-9498 EAP-pwd server missing commit validation for scalar/element: hostapd doesn't validate values received in the EAP-pwd-Commit message, so an attacker could use a specially crafted commit message to manipulate the exchange in order for hostapd to derive a session key from a limited set of possible values. This could result in an attacker being able to complete authentication and gain access to the network. CVE-2019-9499 EAP-pwd peer missing commit validation for scalar/element: wpa_supplicant doesn't validate values received in the EAP-pwd-Commit message, so an attacker could use a specially crafted commit message to manipulate the exchange in order for wpa_supplicant to derive a session key from a limited set of possible values. This could result in an attacker being able to complete authentication and operate as a rogue AP. Note that the Dragonblood moniker also applies to CVE-2019-9494 and CVE-2014-9496 which are vulnerabilities in the SAE protocol in WPA3. SAE is not enabled in Debian stretch builds of wpa, which is thus not vulnerable by default. Due to the complexity of the backporting process, the fix for these vulnerabilities are partial. Users are advised to use strong passwords to prevent dictionary attacks or use a 2.7-based version from stretch-backports (version above 2:2.7+git20190128+0c1e29f-4).

Affected Versions:
'wpa' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For the stable distribution (stretch), these problems have been fixed in version 2:2.4-1+deb9u3. We recommend that you upgrade your wpa Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2014-9496
https://nvd.nist.gov/vuln/detail/CVE-2019-9494
https://nvd.nist.gov/vuln/detail/CVE-2019-9495
https://nvd.nist.gov/vuln/detail/CVE-2019-9497
https://nvd.nist.gov/vuln/detail/CVE-2019-9498
https://nvd.nist.gov/vuln/detail/CVE-2019-9499

References:

https://www.debian.org/security/2019/dsa-4430.html
https://security-tracker.debian.org/tracker/DSA-4430-1

Severity
High
CVSS Score
10.0
Published
2019-04-13
Modified
2019-04-26
Category
Debian Local Security Checks

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