Vulnerability identifier: #VU36557

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-2018-18020

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
QPDF
Client/Desktop applications / File managers, FTP clients

Vendor: SourceForge

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

In QPDF 8.2.1, in libqpdf/QPDFWriter.cc, QPDFWriter::unparseObject and QPDFWriter::unparseChild have recursive calls for a long time, which allows remote attackers to cause a denial of service via a crafted PDF file.

Mitigation
Install update from vendor's website.

Vulnerable software versions

QPDF: 8.2.1

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External links
http://github.com/qpdf/qpdf/issues/243

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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.