WordPress up to 5.0.3 wp_crop_image String path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in WordPress up to 5.0.3. This impacts the function wp_crop_image. This manipulation with the input .jpg?/../../file.jpg as part of String causes path traversal. This vulnerability is handled as CVE-2019-8943. The attack can be initiated remotely. Additionally, an exploit exists.

Detailsinfo

A vulnerability classified as critical was found in WordPress up to 5.0.3 (Content Management System). Affected by this vulnerability is the function wp_crop_image. The manipulation with the input value .jpg?/../../file.jpg 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 integrity, and availability. The summary by CVE is:

WordPress through 5.0.3 allows Path Traversal in wp_crop_image(). An attacker (who has privileges to crop an image) can write the output image to an arbitrary directory via a filename containing two image extensions and ../ sequences, such as a filename ending with the .jpg?/../../file.jpg substring.

The bug was discovered 02/19/2019. The weakness was released 02/20/2019 (Website). The advisory is shared at exploit-db.com. This vulnerability is known as CVE-2019-8943 since 02/19/2019. The attack can be launched remotely. The successful exploitation needs a single authentication. Technical details and also a public exploit are known. MITRE ATT&CK project uses the attack technique T1006 for this issue.

A public exploit has been developed in Python and been published 2 months after the advisory. It is possible to download the exploit 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 1 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 154032 (WordPress Directory Traversal Vulnerability).

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 (46662). Entry connected to this vulnerability is available at VDB-131040. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Content Management System

Name

• WordPress

Version

• 5.0
• 5.0 Beta1
• 5.0 Beta2
• 5.0 Beta3
• 5.0 Beta4
• 5.0 Beta5
• 5.0 rc1
• 5.0 rc2
• 5.0 rc3
• 5.0.1
• 5.0.2
• 5.0.2 rc1
• 5.0.2 rc2
• 5.0.3
• 5.0.3 rc1

License

• open-source

Website

• Product: https://wordpress.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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