Untrusted seach path in 7-Zip

1) Untrusted search path

EUVDB-ID: #VU46819

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-2107

CWE-ID: CWE-426 - Untrusted Search Path

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due untrused search path when loading dynamic libraries during archive extraction. A local user can place a malicious library on the system and trick the victim to open a an archive that will trigger malicious library loading.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

7-Zip: 9.04 - 9.22

External links

http://akky.xrea.jp/security/7-zip4.txt
http://jvn.jp/en/jp/JVN86200862/index.html
http://www.securityfocus.com/bid/96431

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

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

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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