CVE Vulnerability

CVE-2021-21276

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.

6.4 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 4.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact NONE

Scope

9.3 /10

CVSS v3.0 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 4.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References
Link Resource
https://github.com/cydrobolt/polr/commit/b1981709908caf6069b4a29dad3b6739c322c675 Patch Third Party Advisory
https://github.com/cydrobolt/polr/security/advisories/GHSA-vg6w-8w9v-xxqc Third Party Advisory
https://github.com/cydrobolt/polr/releases/tag/2.3.0 Release Notes Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:polrproject:polr:*:*:*:*:*:*:*:*
Information

Published : 2021-02-01 03:15

Updated : 2022-07-11 06:59

NVD link : CVE-2021-21276

Mitre link : CVE-2021-21276

Products Affected
No products.
CWE
NVD-CWE-Other