Remote code execution in adm-zip

1) Path traversal

EUVDB-ID: #VU14135

Risk: High

CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-1002204

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a remote attacker to conduct a directory traversal attack on the target system.

The vulnerability exists in the extractDir() function of QuaZIP due to improper validation of files inside an archive file. A remote unauthenticated attacker can trick the victim into extracting an archive file that contains a file using directory traversal characters, and cause the service to crash or execute arbitrary code with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: This vulnerability is also known as 'Zip-Slip'.

Mitigation

Update to version 0.4.9.

Vulnerable software versions

adm-zip: 0.4.0 - 0.4.8

External links

http://github.com/cthackers/adm-zip/pull/212/commits/6f4dfeb9a2166e93207443879988f97d88a37cde

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted archive.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.