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changedetection.io Vulnerable to Improper Input Validation Leading to LFR/Path Traversal

High severity GitHub Reviewed Published Dec 27, 2024 in dgtlmoon/changedetection.io • Updated Dec 27, 2024

Package

pip changedetection.io (pip)

Affected versions

< 0.48.05

Patched versions

0.48.05

Description

Summary

Improper input validation in the application can allow attackers to perform local file read (LFR) or path traversal attacks. These vulnerabilities occur when user input is used to construct file paths without adequate sanitization or validation. For example, using file:../../../etc/passwd or file: ///etc/passwd can bypass weak validations and allow unauthorized access to sensitive files. Even though this has been addressed in previous patch, it is still insufficient.

Details

The check in this line of code is insufficient.

if re.search(r'^file:/', url.strip(), re.IGNORECASE):

The attacker can still bypass this by using:
-file:../../../../etc/passwd
-file: ///etc/passwd (with space before /)

PoC

  • Open up a changedetection.io instance with a webdriver configured.
  • Create a new watch with file:../../../../etc/passwd.
  • Check the watch preview.
  • The contents of /etc/passwd should pop out.

Screenshots

image
image

References

@dgtlmoon dgtlmoon published to dgtlmoon/changedetection.io Dec 27, 2024
Published by the National Vulnerability Database Dec 27, 2024
Published to the GitHub Advisory Database Dec 27, 2024
Reviewed Dec 27, 2024
Last updated Dec 27, 2024

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
Changed
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:C/C:H/I:N/A:N

Weaknesses

CVE ID

CVE-2024-56509

GHSA ID

GHSA-j5vv-6wjg-cfr8

Source code

Credits

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