Vulnerability identifier: #VU17337

Vulnerability risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-15518

CWE-ID: CWE-611

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Qt
Universal components / Libraries / Scripting languages

Vendor: Trolltech

Description
The vulnerability allows a remote attacker to conduct XXE-attack.

The vulnerability exists due to improper handling of XML External Entities (XXEs) when parsing an XML file. A remote attacker can trick the victim into opening an XML file that submits malicious input, trigger a double-free error in QXmlStream and cause the service to crash.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Qt: 5.6 - 5.6.3, 5.5 - 5.5.1, 5.4 - 5.4.2, 5.3 - 5.3.2, 5.2 - 5.2.1, 5.1, 5.0, 5.11 - 5.11.2, 5.10 - 5.10.1, 5.9 - 5.9.7, 5.8, 5.7 - 5.7.1

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External links
http://blog.qt.io/blog/2018/12/04/qt-5-11-3-released-important-security-updates/

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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.