DFArc/DFArc2 up to 3.13 D-Mod Extractor path traversal

Summaryinfo

A vulnerability marked as critical has been reported in DFArc and DFArc2 up to 3.13. This impacts an unknown function of the component D-Mod Extractor. Performing a manipulation results in path traversal. This vulnerability was named CVE-2018-0496. The attack may be initiated remotely. There is no available exploit. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as critical has been found in DFArc and DFArc2 up to 3.13. This affects an unknown code of the component D-Mod Extractor. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as 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. This is going to have an impact on integrity, and availability. The summary by CVE is:

Directory traversal issues in the D-Mod extractor in DFArc and DFArc2 (as well as in RTsoft's Dink Smallwood HD / ProtonSDK version) before 3.14 allow an attacker to overwrite arbitrary files on the user's system.

The bug was discovered 11/27/2017. The weakness was presented 06/12/2018 as confirmed git commit (GIT Repository). It is possible to read the advisory at git.savannah.gnu.org. This vulnerability is uniquely identified as CVE-2018-0496 since 11/27/2017. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. 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 197 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 120902 (Fedora 28 : freedink-dfarc (2018-f2e8788852)), 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 176688 (Debian Security Update for freedink-dfarc (DLA 1686-1)).

Upgrading to version 3.14 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.savannah.gnu.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published 3 days after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (120902). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• DFArc
• DFArc2

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13

CPE 2.3info

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CPE 2.2info

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