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CVE-2023-34448— Grav Server-side Template Injection (SSTI) via Twig Default Filters

Quick assessment

Affected
getgrav grav
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Grav是一套可扩展的用于个人博客、小型内容发布平台和单页产品展示的CMS（内容管理系统）。 Grav 1.7.42之前版本存在安全漏洞，该漏洞源于存在服务器端模板注入 (SSTI)漏洞。

CVSS 8.8 · High EPSS 4.52% · P91

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-34448

Vulnerability Information
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Vulnerability Title
Grav Server-side Template Injection (SSTI) via Twig Default Filters
Source: CVE Program / CVE List V5
Vulnerability Description
Grav is a flat-file content management system. Prior to version 1.7.42, the patch for CVE-2022-2073, a server-side template injection vulnerability in Grav leveraging the default `filter()` function, did not block other built-in functions exposed by Twig's Core Extension that could be used to invoke arbitrary unsafe functions, thereby allowing for remote code execution. A patch in version 1.74.2 overrides the built-in Twig `map()` and `reduce()` filter functions in `system/src/Grav/Common/Twig/Extension/GravExtension.php` to validate the argument passed to the filter in `$arrow`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Grav 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav是一套可扩展的用于个人博客、小型内容发布平台和单页产品展示的CMS（内容管理系统）。 Grav 1.7.42之前版本存在安全漏洞，该漏洞源于存在服务器端模板注入 (SSTI)漏洞。
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
getgrav grav < 1.7.42 -

II. Public POCs for CVE-2023-34448

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III. Intelligence Information for CVE-2023-34448

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Patches & Fixes for CVE-2023-34448 (2)

Vendor Advisories for CVE-2023-34448 (2)

Other References for CVE-2023-34448 (1)

Same Patch Batch · getgrav · 2023-06-14 · 5 CVEs total

CVE-2023-34251 10.0 CRITICAL Grav Server Side Template Injection vulnerability
CVE-2023-34253 8.8 HIGH Grav vulnerable to Server-side Template Injection (SSTI) via Denylist Bypass
CVE-2023-34252 8.8 HIGH Grav Server-side Template Injection via Insufficient Validation in filterFilter
CVE-2023-34452 5.4 MEDIUM Grav vulnerable to Self Cross Site Scripting in /forgot_password

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-20

V. Comments for CVE-2023-34448

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