Foo Labs Xpdf 4.00 JBIG2Stream.cc getBlackCode memory corruption

Summaryinfo

A vulnerability has been found in Foo Labs Xpdf 4.00 and classified as critical. The impacted element is the function JBIG2MMRDecoder::getBlackCode of the file JBIG2Stream.cc. Performing a manipulation results in memory corruption. This vulnerability is known as CVE-2018-8102. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Foo Labs Xpdf 4.00 (Document Reader Software). It has been classified as critical. This affects the function JBIG2MMRDecoder::getBlackCode of the file JBIG2Stream.cc. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The JBIG2MMRDecoder::getBlackCode function in JBIG2Stream.cc in xpdf 4.00 allows attackers to launch denial of service (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 published 03/14/2018 (Website). It is possible to read the advisory at forum.xpdfreader.com. This vulnerability is uniquely identified as CVE-2018-8102 since 03/13/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. 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 19 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 232030 (Linux Distros Unpatched Vulnerability : CVE-2018-8102), 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 (232030). Similar entries are available at VDB-114493, VDB-114494, VDB-114496 and VDB-114497. 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

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

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

Discussion