A vulnerability was found in Square Open Source Retrofit (the affected version is unknown) and classified as critical. Affected by this issue is an unknown code of the component XML Data Handler. The manipulation with an unknown input leads to a xml external entity reference vulnerability. Using CWE to declare the problem leads to CWE-611. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Square Open Source Retrofit version Prior to commit 4a693c5aeeef2be6c7ecf80e7b5ec79f6ab59437 contains a XML External Entity (XXE) vulnerability in JAXB that can result in An attacker could use this to remotely read files from the file system or to perform SSRF.. This vulnerability appears to have been fixed in After commit 4a693c5aeeef2be6c7ecf80e7b5ec79f6ab59437.

The bug was discovered 04/18/2018. The weakness was shared 12/20/2018 (Website). The advisory is available at github.com. This vulnerability is handled as CVE-2018-1000844 since 12/20/2018. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

The vulnerability was handled as a non-public zero-day exploit for at least 246 days. During that time the estimated underground price was around $0-$5k.

Applying the patch 4a693c5aeeef2be6c7ecf80e7b5ec79f6ab59437 is able to eliminate this problem.

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• Square Open Source

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• Retrofit

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