A vulnerability, which was classified as critical, has been found in okular up to 18.08. This issue affects the function unpackDocumentArchive of the file core/document.cpp. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is integrity, and availability. The summary by CVE is:

okular version 18.08 and earlier contains a Directory Traversal vulnerability in function "unpackDocumentArchive(...)" in "core/document.cpp" that can result in Arbitrary file creation on the user workstation. This attack appear to be exploitable via he victim must open a specially crafted Okular archive. This issue appears to have been corrected in version 18.08.1

The bug was discovered 09/03/2018. The weakness was released 09/06/2018 (Website). It is possible to read the advisory at bugs.kde.org. The identification of this vulnerability is CVE-2018-1000801 since 09/06/2018. 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 of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 117643 (Debian DLA-1516-1 : okular security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176486 (Debian Security Update for okular (DSA 4303-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (117643).

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• okular

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• 18.08

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