Multiple vulnerabilities in 7-Zip

Published: 2023-08-25

Risk	High
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2023-31102 CVE-2023-40481
CWE-ID	CWE-191 CWE-787
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	7-Zip Client/Desktop applications / Software for archiving
Vendor	7-zip.org

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Integer underflow

EUVDB-ID: #VU80003

Risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-31102

CWE-ID: CWE-191 - Integer underflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to integer underflow when parsing 7Z files. A remote attacker can trick the victim to open a specially crafted archive, trigger an integer underflow and execute arbitrary code on the target system.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

7-Zip: 2.00 Beta 1 - 22.01

CPE2.3

External links

https://www.zerodayinitiative.com/advisories/ZDI-23-1165/
https://sourceforge.net/p/sevenzip/discussion/45797/thread/713c8a8269/

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.

2) Out-of-bounds write

EUVDB-ID: #VU80002