Poppler 0.72.0 FileSpec.cc Object::dictLookup input validation

Summaryinfo

A vulnerability was found in Poppler 0.72.0. It has been classified as problematic. This affects the function Object::dictLookup of the file FileSpec.cc. The manipulation leads to input validation. This vulnerability is traded as CVE-2018-20650. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Poppler 0.72.0 (Document Reader Software). It has been rated as problematic. This issue affects the function Object::dictLookup of the file FileSpec.cc. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. The summary by CVE is:

A reachable Object::dictLookup assertion in Poppler 0.72.0 allows attackers to cause a denial of service due to the lack of a check for the dict data type, as demonstrated by use of the FileSpec class (in FileSpec.cc) in pdfdetach.

The bug was discovered 12/28/2018. The weakness was shared 01/01/2019 (Website). The advisory is shared at gitlab.freedesktop.org. The identification of this vulnerability is CVE-2018-20650 since 01/01/2019. 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 4 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 121334 (Fedora 29 : poppler (2019-7ff7f5093e)), 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 197349 (Ubuntu Security Notification for Poppler Vulnerabilities (USN-3865-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (121334) and SecurityFocus (BID 106459†). The entries VDB-126426, VDB-128429 and VDB-128517 are related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Document Reader Software

Name

• Poppler

Version

• 0.72.0

License

• open-source

CPE 2.3info

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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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