#VU22873 Path traversal in Retrofit - CVE-2018-1000850

Vulnerability identifier: #VU22873

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-1000850

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Retrofit
Mobile applications / Libraries for mobile applications

Vendor: Square

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences when processing POST, PUT or DELETE requests within the addPathParameter() method in RequestBuilder class. A remote attacker can trick the victim to follow a specially crafted URL and gain access to otherwise restricted resources.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Retrofit: before 2.0.0

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External links
https://github.com/square/retrofit/blob/master/CHANGELOG.md
https://github.com/square/retrofit/commit/b9a7f6ad72073ddd40254c0058710e87a073047d#diff-943ec7ed35e68201824904d1dc0ec982
https://ihacktoprotect.com/post/retrofit-path-traversal/
https://lists.apache.org/thread.html/519eb0fd45642dcecd9ff74cb3e71c20a4753f7d82e2f07864b5108f@%3Cdev.drill.apache.org%3E
https://lists.apache.org/thread.html/b0656d359c7d40ec9f39c8cc61bca66802ef9a2a12ee199f5b0c1442@%3Cdev.drill.apache.org%3E

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.