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CVE-2021-29454— Sandbox Escape by math function in smarty

Quick assessment

Affected
smarty-php smarty
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Smarty是Smarty 是 PHP 的模板引擎，有助于将表示 (HTML/CSS) 与应用程序逻辑分离。 Smarty存在安全漏洞，该漏洞源于在版本3.1.42和4.0.2之前，模板作者可以通过构建一个恶意的数学字符串来运行任意PHP代码。如果一个数学字符串作为用户提供的数据传递给数学函数，外部用户可以通过制造一个恶意的数学字符串来运行任意PHP代码。用户应该升级到3.1.42或4.0.2版本来接收补丁。

CVSS 8.1 · High EPSS 1.93% · P79

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-29454

Vulnerability Information
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Vulnerability Title
Sandbox Escape by math function in smarty
Source: CVE Program / CVE List V5
Vulnerability Description
Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. Prior to versions 3.1.42 and 4.0.2, template authors could run arbitrary PHP code by crafting a malicious math string. If a math string was passed through as user provided data to the math function, external users could run arbitrary PHP code by crafting a malicious math string. Users should upgrade to version 3.1.42 or 4.0.2 to receive a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Smarty 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Smarty是Smarty 是 PHP 的模板引擎，有助于将表示 (HTML/CSS) 与应用程序逻辑分离。 Smarty存在安全漏洞，该漏洞源于在版本3.1.42和4.0.2之前，模板作者可以通过构建一个恶意的数学字符串来运行任意PHP代码。如果一个数学字符串作为用户提供的数据传递给数学函数，外部用户可以通过制造一个恶意的数学字符串来运行任意PHP代码。用户应该升级到3.1.42或4.0.2版本来接收补丁。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
smarty-php smarty < 3.1.42 -

II. Public POCs for CVE-2021-29454

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III. Intelligence Information for CVE-2021-29454

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Patches & Fixes for CVE-2021-29454 (1)

Vendor Advisories for CVE-2021-29454 (3)

Mailing List Discussions for CVE-2021-29454 (3)

Other References for CVE-2021-29454 (3)

IV. Related Vulnerabilities

Same product: smarty
Same vendor: smarty-php
Same weakness: CWE-74

V. Comments for CVE-2021-29454

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