hostapd/wpa_supplicant up to 2.7 SAE information disclosure

Summaryinfo

A vulnerability labeled as problematic has been found in hostapd and wpa_supplicant up to 2.7. This impacts an unknown function of the component SAE. Such manipulation leads to information disclosure. This vulnerability is uniquely identified as CVE-2019-9494. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in hostapd and wpa_supplicant up to 2.7. Affected by this issue is an unknown part of the component SAE. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

The implementations of SAE in hostapd and wpa_supplicant are vulnerable to side channel attacks as a result of observable timing differences and cache access patterns. An attacker may be able to gain leaked information from a side channel attack that can be used for full password recovery. Both hostapd with SAE support and wpa_supplicant with SAE support prior to and including version 2.7 are affected.

The bug was discovered 04/10/2019. The weakness was disclosed 04/17/2019 by Joshua (Website). The advisory is shared for download at w1.fi. This vulnerability is handled as CVE-2019-9494 since 03/01/2019. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability was handled as a non-public zero-day exploit for at least 7 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176852 (Debian Security Update for wpa (DSA 4430-1)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 71796†). The entries VDB-73689, VDB-133473, VDB-133475 and VDB-133476 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• hostapd
• wpa_supplicant

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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