8.6

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2024-51998

CVE-2024-51998: changedetection.io path traversal using file URI scheme without supplying hostname

Summary

The validation for the file URI scheme falls short, and results in an attacker being able to read any file on the system. This issue only affects instances with a webdriver enabled, and ALLOW_FILE_URI false or not defined.

Details

The check used for URL protocol, is_safe_url, allows file: as a URL scheme:

https://github.com/dgtlmoon/changedetection.io/blob/e0abf0b50507a8a3d0c1d8522ab23519b3e4cdf4/changedetectionio/model/Watch.py#L11-L13

It later checks if local files are permitted, but one of the preconditions for the check is that the URL starts with file://. The issue comes with the fact that the file URI scheme is not required to have double slashes.

A valid file URI must therefore begin with either file:/path (no hostname), file:///path (empty hostname), or file://hostname/path. — Wikipedia

https://github.com/dgtlmoon/changedetection.io/blob/e0abf0b50507a8a3d0c1d8522ab23519b3e4cdf4/changedetectionio/processors/init.py#L37-L41

PoC

Open up a changedetection.io instance with a webdriver configured
Create a new watch: file:/etc/passwd or a similar path for your operating system. Enable webdriver mode
Wait for it to be checked
Open preview
Notice contents of the file

(GitHub Advisory)

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CVE-2024-51998

CVE-2024-51998:

8.6

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
changedetection.io	pip	<= 0.47.5	0.47.6

Technical Details

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Root Cause Analysis

The vulnerability stems from two key components: 1) The is_safe_url function in Watch.py explicitly allows 'file:' protocol in its SAFE_PROTOCOL_REGEX, creating the initial vulnerability surface. 2) The subsequent security check in processors/init.py uses an incomplete regex (^file://) that fails to account for valid file URI formats without double slashes. Together, these allow attackers to bypass file access restrictions using file:/path syntax. The commit fix shows the regex was updated to '^file:/', confirming these were the vulnerable points. Both functions are directly referenced in the vulnerability details and CVE description.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

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WAF Protection Rules

WAF Rule

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Reasoning

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8.6

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2024-51998: changedetection.io path traversal using file URI scheme without supplying hostname

Summary

Details

PoC

CVE-2024-51998:

8.6

-

Basic Information

Basic Information

Is this CVE running in your environment?

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

Vulnerability IntelligenceMiggo AI

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WAF Protection Rules

WAF Rule

Reasoning

CVE-2024-51998: changedetection.io path traversal using file URI scheme without supplying hostname

Summary

Details

PoC

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

8.6

8.6

Technical Details

Basic Information

Basic Information

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
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