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txtdot SSRF vulnerability in /proxy

High
artegoser published GHSA-4c78-229v-hf6m Mar 5, 2024

Package

txtdot/txtdot (GitHub Packages)

Affected versions

>= 1.4.0, < 1.6.1

Patched versions

>= 1.6.1

Description

Summary

Serveral Server-Side Request Forgery (SSRF) vulnerability in the /proxy route of txtdot allows remote attackers to use the server as a proxy to send HTTP GET requests to arbitrary targets and retrieve information in the internal network.

Details

The URL from user input is not checked before sending server-side request:

https://github.com/TxtDot/txtdot/blob/a7fdaf80fdf45abefe83b2eb5135ba112142dc74/src/routes/browser/proxy.ts#L6-L17

This allows SSRF attacks.

PoC

https://txt.artegoser.ru/proxy?url=http://localhost:8080

Impact

Remote attackers can retrieve information in the internal network.

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVE ID

CVE-2024-41813

Weaknesses

Server-Side Request Forgery (SSRF)

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Learn more on MITRE.

Credits