Remote code execution in Smarty

1) Code Injection

EUVDB-ID: #VU63344

Risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2022-29221

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: Yes

Description

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

The vulnerability exists due to improper input validation when processing block name or include file name. A remote attacker can send a specially crafted request and execute arbitrary PHP 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

Smarty: 3.1 - 4.1.0

CPE2.3

• cpe:2.3:a:smarty_php_net:smarty:3.1.44:*:*:*:*:*:*:*
• cpe:2.3:a:smarty_php_net:smarty:4.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:smarty_php_net:smarty:4.1.0:*:*:*:*:*:*:*

External links

https://github.com/smarty-php/smarty/releases/tag/v3.1.45
https://github.com/smarty-php/smarty/releases/tag/v4.1.1

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. However, proof of concept for this vulnerability is available.