Foo Labs Xpdf 4.00 Stream.cc BufStream::lookChar memory corruption

Summaryinfo

A vulnerability was found in Foo Labs Xpdf 4.00. It has been classified as critical. This impacts the function BufStream::lookChar of the file Stream.cc. The manipulation leads to memory corruption. This vulnerability is uniquely identified as CVE-2018-8104. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Foo Labs Xpdf 4.00 (Document Reader Software). It has been rated as critical. This issue affects the function BufStream::lookChar of the file Stream.cc. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The BufStream::lookChar function in Stream.cc in xpdf 4.00 allows attackers to launch denial of service (heap-based buffer over-read and application crash) via a specific pdf file, as demonstrated by pdftohtml.

The bug was discovered 02/22/2018. The weakness was disclosed 03/14/2018 (Website). The advisory is shared at forum.xpdfreader.com. The identification of this vulnerability is CVE-2018-8104 since 03/13/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 19 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 232062 (Linux Distros Unpatched Vulnerability : CVE-2018-8104), which helps to determine the existence of the flaw in a target environment.

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 (232062). The entries VDB-114493, VDB-114494, VDB-114495 and VDB-114496 are pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Document Reader Software

Vendor

• Foo Labs

Name

• Xpdf

Version

• 4.00

License

• open-source

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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