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CVE-2021-21276— Privilege escalation in Polr

Quick assessment

Affected
cydrobolt polr
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.

Cydrobolt Polr是Cydrobolt个人开发者的一个基于Php的可通过响应Api为Web应用缩短URL链接的代码库。 Cydrobolt Polr 存在安全漏洞，攻击者可利用该漏洞获得该实例的管理权限。

CVSS 9.3 · Critical EPSS 7.16% · P94

Public Exploits 1

ExploitDB · 1 EDB-51277 [webapps]

Possible ATT&CK Techniques 1 AI

T1136.003 · Cloud Account
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I. Basic Information for CVE-2021-21276

Vulnerability Information
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Vulnerability Title
Privilege escalation in Polr
Source: CVE Program / CVE List V5
Vulnerability Description
Polr is an open source URL shortener. in Polr before version 2.3.0, a vulnerability in the setup process allows attackers to gain admin access to site instances, even if they do not possess an existing account. This vulnerability exists regardless of users' settings. If an attacker crafts a request with specific cookie headers to the /setup/finish endpoint, they may be able to obtain admin privileges on the instance. This is caused by a loose comparison (==) in SetupController that is susceptible to attack. The project has been patched to ensure that a strict comparison (===) is used to verify the setup key, and that /setup/finish verifies that no users table exists before performing any migrations or provisioning any new accounts. This is fixed in version 2.3.0. Users can patch this vulnerability without upgrading by adding abort(404) to the very first line of finishSetup in SetupController.php.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Cydrobolt Polr 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cydrobolt Polr是Cydrobolt个人开发者的一个基于Php的可通过响应Api为Web应用缩短URL链接的代码库。 Cydrobolt Polr 存在安全漏洞，攻击者可利用该漏洞获得该实例的管理权限。
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
cydrobolt polr < 2.3.0 -

II. Public POCs for CVE-2021-21276

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III. Intelligence Information for CVE-2021-21276

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Patches & Fixes for CVE-2021-21276 (1)

Vendor Advisories for CVE-2021-21276 (1)

Exploits & Public PoCs for CVE-2021-21276 (1)

Other References for CVE-2021-21276 (1)

IV. Related Vulnerabilities

Same weakness: CWE-863

V. Comments for CVE-2021-21276

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