Multiple vulnerabilities in Smarty



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-26120
CVE-2021-26119
CWE-ID CWE-94
CWE-264
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Public exploit code for vulnerability #2 is available.
Vulnerable software
 Smarty
Web applications / CMS

Vendor smarty.php.net

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Code Injection

EUVDB-ID: #VU50870

Risk: Medium

CVSSv4.0: 7.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2021-26120

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

Exploit availability: Yes

Description

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

The vulnerability exists due to improper input validation when processing data passed via an unexpected function name after a "{function name=" substring. A remote user 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: 3.1.0 - 3.1.38

CPE2.3 External links

https://github.com/smarty-php/smarty/blob/master/CHANGELOG.md


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user 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.

2) Security restrictions bypass

EUVDB-ID: #VU50869

Risk: Medium

CVSSv4.0: 7.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2021-26119

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: Yes

Description

The vulnerability allows a remote user to escalate privileges within the application.

The vulnerability exists due to application does not properly impose security restrictions and allows to escape sandbox by allowing to access the $smarty.template_object. A remote user can perform template injection and execute arbitrary PHP code on the server.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Smarty: 3.1.0 - 3.1.38

CPE2.3 External links

https://github.com/smarty-php/smarty/blob/master/CHANGELOG.md


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user 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.



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