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CVE-2023-34253— Grav vulnerable to Server-side Template Injection (SSTI) via Denylist Bypass

Quick assessment

Affected
getgrav grav
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.

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，允许攻击者通过注入恶意模板来执行远程代码。

CVSS 8.8 · High EPSS 2.07% · P81
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I. Basic Information for CVE-2023-34253

Vulnerability Information
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Vulnerability Title
Grav vulnerable to Server-side Template Injection (SSTI) via Denylist Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Grav is a flat-file content management system. Prior to version 1.7.42, the denylist introduced in commit 9d6a2d to prevent dangerous functions from being executed via injection of malicious templates was insufficient and could be easily subverted in multiple ways -- (1) using unsafe functions that are not banned, (2) using capitalised callable names, and (3) using fully-qualified names for referencing callables. Consequently, a low privileged attacker with login access to Grav Admin panel and page creation/update permissions is able to inject malicious templates to obtain remote code execution. A patch in version 1.7.42 improves the denylist.
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
不完整的黑名单
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，允许攻击者通过注入恶意模板来执行远程代码。
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-2023-34253

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III. Intelligence Information for CVE-2023-34253

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Patches & Fixes for CVE-2023-34253 (2)

Vendor Advisories for CVE-2023-34253 (2)

Other References for CVE-2023-34253 (1)

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

CVE-2023-34251 10.0 CRITICAL Grav Server Side Template Injection vulnerability
CVE-2023-34448 8.8 HIGH Grav Server-side Template Injection (SSTI) via Twig Default Filters
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-184

V. Comments for CVE-2023-34253

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