Debian DLA-1867-1 : wpa security update

high Nessus Plugin ID 127476

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Synopsis

The remote Debian host is missing a security update.

Description

Several vulnerabilities were discovered in WPA supplicant / hostapd.
Some of them could only partially be mitigated, please read below for details.

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.

This issue has only very partially been mitigated against by reducing measurable timing differences during private key operations. More work is required to fully mitigate this vulnerability.

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 have resulted in attacks that would have been able to complete EAP-pwd authentication exchange without the attacker having to know the password. This did 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 didn't validate values received in the EAP-pwd-Commit message, so an attacker could have used 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 have resulted in an attacker being able to complete authentication and gain access to the network.

This issue could only partially be mitigated.

CVE-2019-9499

EAP-pwd peer missing commit validation for scalar/element:
wpa_supplicant didn't validate values received in the EAP-pwd-Commit message, so an attacker could have used 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 have resulted in an attacker being able to complete authentication and operate as a rogue AP.

This issue could only partially be mitigated.

CVE-2019-11555

The EAP-pwd implementation did't properly validate fragmentation reassembly state when receiving an unexpected fragment. This could have lead to a process crash due to a NULL pointer derefrence.

An attacker in radio range of a station or access point with EAP-pwd support could cause a crash of the relevant process (wpa_supplicant or hostapd), ensuring a denial of service.

For Debian 8 'Jessie', these problems have been fixed in version 2.3-1+deb8u8.

We recommend that you upgrade your wpa packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected packages.

Plugin Details

Severity: High

ID: 127476

File Name: debian_DLA-1867.nasl

Version: 1.4

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 8/12/2019

Updated: 1/11/2021

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:hostapd, p-cpe:/a:debian:debian_linux:wpagui, p-cpe:/a:debian:debian_linux:wpasupplicant, p-cpe:/a:debian:debian_linux:wpasupplicant-udeb, cpe:/o:debian:debian_linux:8.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 7/31/2019

Vulnerability Publication Date: 4/17/2019

Reference Information

CVE: CVE-2019-11555, CVE-2019-9495, CVE-2019-9497, CVE-2019-9498, CVE-2019-9499

Detections

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