Foo Labs Xpdf 4.00 JPXStream.cc JPXStream::fillReadBuf null pointer dereference

Summaryinfo

A vulnerability classified as problematic has been found in Foo Labs Xpdf 4.00. The impacted element is the function JPXStream::fillReadBuf of the file JPXStream.cc. This manipulation causes null pointer dereference. This vulnerability is handled as CVE-2018-7452. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in Foo Labs Xpdf 4.00 (Document Reader Software) and classified as problematic. Affected by this vulnerability is the function JPXStream::fillReadBuf of the file JPXStream.cc. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

A NULL pointer dereference in JPXStream::fillReadBuf in JPXStream.cc in xpdf 4.00 allows attackers to launch denial of service via a specific pdf file, as demonstrated by pdftohtml.

The bug was discovered 02/12/2018. The weakness was released 02/24/2018 (Website). It is possible to read the advisory at forum.xpdfreader.com. This vulnerability is known as CVE-2018-7452 since 02/23/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 12 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 232053 (Linux Distros Unpatched Vulnerability : CVE-2018-7452), which helps to determine the existence of the flaw in a target environment. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277720 (Fedora Security Update for xpdf (FEDORA-2019-b3aec99d2c)).

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 (232053). Entries connected to this vulnerability are available at VDB-113498, VDB-113499, VDB-113500 and VDB-113793. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Document Reader Software

Vendor

• Foo Labs

Name

• Xpdf

Version

• 4.00

License

• open-source

CPE 2.3info

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CPE 2.2info

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Be aware that VulDB is the high quality source for vulnerability data.

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