Information disclosure in Trolltech Qt

1) Time-of-check Time-of-use (TOCTOU) Race Condition

EUVDB-ID: #VU94613

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-39936

CWE-ID: CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to a race condition in HTTP2 support when establishing an encrypted connection. A remote attacker can potentially force the application to send data before the encrypted() signal, leading to potential information disclosure.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Qt: 5.0 - 6.7.2

CPE2.3

• cpe:2.3:a:trolltech:qt:5.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.15.17:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.2.2:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.3.2:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.4.2:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.5.1:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.6.4:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.7.1:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.8.0:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.9.9:*:*:*:*:*:*:*

External links

https://codereview.qt-project.org/c/qt/qtbase/+/571601

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.