Tecrail Responsive FileManager 9.13.4 ajax_calls.php save_img path path traversal

Summaryinfo

A vulnerability classified as critical was found in Tecrail Responsive FileManager 9.13.4. Impacted is the function save_img of the file ajax_calls.php. Such manipulation of the argument path as part of Image File leads to path traversal. This vulnerability is referenced as CVE-2018-20794. It is possible to launch the attack remotely. Furthermore, an exploit is available.

Detailsinfo

A vulnerability was found in Tecrail Responsive FileManager 9.13.4 and classified as critical. Affected by this issue is the function save_img of the file ajax_calls.php. The manipulation of the argument path as part of a Image File 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. CVE summarizes:

tecrail Responsive FileManager 9.13.4 allows remote attackers to write to an arbitrary image file (jpg/jpeg/png) via path traversal with the path parameter, through the save_img action in ajax_calls.php.

The bug was discovered 12/12/2018. The weakness was published 02/25/2019 as EDB-ID 45987 as not defined exploit (Exploit-DB). The advisory is shared for download at exploit-db.com. This vulnerability is handled as CVE-2018-20794 since 02/25/2019. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1006.

After immediately, there has been an exploit disclosed. The exploit is available at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 75 days. During that time the estimated underground price was around $0-$5k. By approaching the search of inurl:ajax_calls.php it is possible to find vulnerable targets with Google Hacking.

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 Exploit-DB (45987). Similar entries are available at VDB-131175, VDB-131176, VDB-131177 and VDB-131178. Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Tecrail

Name

• Responsive FileManager

Version

• 9.13.4

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion