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Security Advisories: GSA_kwCzR0hTQS1qNXZ2LTZ3amctY2ZyOM4ABCyQ

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

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

Permalink: https://github.com/advisories/GHSA-j5vv-6wjg-cfr8
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1qNXZ2LTZ3amctY2ZyOM4ABCyQ
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: 27 days ago
Updated: 27 days ago

CVSS Score: 8.6
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS Percentage: 0.00044
EPSS Percentile: 0.12544

Identifiers: GHSA-j5vv-6wjg-cfr8, CVE-2024-56509
References:

Repository: https://github.com/dgtlmoon/changedetection.io
Blast Radius: 1.0

Affected Packages

pypi:changedetection.io

Dependent packages: 0
Dependent repositories: 0
Downloads: 8,699 last month
Affected Version Ranges: < 0.48.05
Fixed in: 0.48.05
All affected versions: 0.38.2, 0.39.1, 0.39.2, 0.39.3, 0.39.4, 0.39.5, 0.39.6, 0.39.7, 0.39.8, 0.39.9, 0.39.10, 0.39.11, 0.39.12, 0.39.13, 0.39.14, 0.39.15, 0.39.16, 0.39.17, 0.39.18, 0.39.19, 0.39.20, 0.39.21, 0.39.22, 0.40.0, 0.40.2, 0.40.3, 0.41.1, 0.42.1, 0.42.2, 0.42.3, 0.43.1, 0.43.2, 0.44.1, 0.45.1, 0.45.2, 0.45.3, 0.45.4, 0.45.5, 0.45.6, 0.45.7, 0.45.8, 0.45.9, 0.45.11, 0.45.12, 0.45.13, 0.45.14, 0.45.15, 0.45.16, 0.45.17, 0.45.18, 0.45.19, 0.45.20, 0.45.21, 0.45.22, 0.45.23, 0.45.24, 0.45.25, 0.45.26, 0.46.0, 0.46.1, 0.46.2, 0.46.3, 0.46.4, 0.47.0, 0.47.1, 0.47.2, 0.47.3, 0.47.4, 0.47.5, 0.47.6, 0.48.0, 0.48.1, 0.48.2, 0.48.3, 0.48.4
All unaffected versions: 0.48.5, 0.48.6