Qt up to 5.14.2 OpenSSL Error Handshake denial of service

Summaryinfo

A vulnerability marked as problematic has been reported in Qt up to 5.14.2. Impacted is an unknown function of the component OpenSSL Error Handler. The manipulation as part of Handshake leads to denial of service. This vulnerability is listed as CVE-2020-13962. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Qt up to 5.14.2. It has been rated as problematic. This issue affects an unknown code of the component OpenSSL Error Handler. The manipulation as part of a Handshake leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. The summary by CVE is:

Qt 5.12.2 through 5.14.2, as used in unofficial builds of Mumble 1.3.0 and other products, mishandles OpenSSL's error queue, which can cause a denial of service to QSslSocket users. Because errors leak in unrelated TLS sessions, an unrelated session may be disconnected when any handshake fails. (Mumble 1.3.1 is not affected, regardless of the Qt version.)

The weakness was presented 06/09/2020. The identification of this vulnerability is CVE-2020-13962 since 06/08/2020. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 301536 (Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS : Qt vulnerabilities (USN-8076-1)), which helps to determine the existence of the flaw in a target environment.

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 Tenable (301536). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• Qt

Version

• 5.14.0
• 5.14.1
• 5.14.2

License

• open-source

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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