#VU46819 Untrusted search path in 7-Zip - CVE-2017-2107

Vulnerability identifier: #VU46819

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-2107

CWE-ID: CWE-426

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
7-Zip
Client/Desktop applications / Software for archiving

Vendor: 7-zip.org

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 beta - 9.22

---

External links
https://akky.xrea.jp/security/7-zip4.txt
https://jvn.jp/en/jp/JVN86200862/index.html
https://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.

Is there known malware, which exploits this vulnerability?

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