ReFirm binwalk up to 2.3.2 PFS Extractor unpfs.py path traversal

Summaryinfo

A vulnerability has been found in ReFirm binwalk up to 2.3.2 and classified as critical. This issue affects some unknown processing of the file src/binwalk/plugins/unpfs.py of the component PFS Extractor. This manipulation causes path traversal. This vulnerability is registered as CVE-2022-4510. The attack needs to be launched locally. Furthermore, an exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in ReFirm binwalk up to 2.3.2. It has been declared as critical. Affected by this vulnerability is an unknown part of the file src/binwalk/plugins/unpfs.py of the component PFS Extractor. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A path traversal vulnerability was identified in ReFirm Labs binwalk from version 2.1.2b through 2.3.3 included. By crafting a malicious PFS filesystem file, an attacker can get binwalk's PFS extractor to extract files at arbitrary locations when binwalk is run in extraction mode (-e option). Remote code execution can be achieved by building a PFS filesystem that, upon extraction, would extract a malicious binwalk module into the folder .config/binwalk/plugins. This vulnerability is associated with program files src/binwalk/plugins/unpfs.py. This issue affects binwalk from 2.1.2b through 2.3.3 included.

The weakness was published 01/27/2023. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2022-4510 since 12/15/2022. It demands that the victim is doing some kind of user interaction. Technical details and also a public exploit are known. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 278741 (Debian dla-4410 : binwalk - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.3.3 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Exploit-DB (51249), Tenable (278741) and EUVD (EUVD-2023-0317). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• ReFirm

Name

• binwalk

Version

• 2.3.0
• 2.3.1
• 2.3.2

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion