QPDF 6.0.0 libqpdf QPDFTokenizer.cc resolveLiteral memory corruption

Summaryinfo

A vulnerability was found in QPDF 6.0.0 and classified as problematic. Affected by this vulnerability is the function QPDFTokenizer::resolveLiteral of the file QPDFTokenizer.cc of the component libqpdf. Executing a manipulation can lead to memory corruption. This vulnerability is registered as CVE-2017-11624. The attack needs to be launched locally. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in QPDF 6.0.0. This vulnerability affects the function QPDFTokenizer::resolveLiteral of the file QPDFTokenizer.cc of the component libqpdf. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect availability. CVE summarizes:

A stack-consumption vulnerability was found in libqpdf in QPDF 6.0.0, which allows attackers to cause a denial of service via a crafted file, related to the QPDFTokenizer::resolveLiteral function in QPDFTokenizer.cc after two consecutive calls to QPDFObjectHandle::parseInternal, aka an "infinite loop."

The bug was discovered 06/04/2017. The weakness was published 07/25/2017 (Website). The advisory is shared for download at somevulnsofadlab.blogspot.jp. This vulnerability was named CVE-2017-11624 since 07/25/2017. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 51 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 102215 (Fedora 26 : qpdf (2017-e58a762c3f)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171628 (SUSE Enterprise Linux Security Update for qpdf (SUSE-SU-2018:3066-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (102215). Similar entries are available at VDB-101717, VDB-101718, VDB-101719 and VDB-104501. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• QPDF

Version

• 6.0.0

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Once again VulDB remains the best source for vulnerability data.

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