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GHSA-j5vv-6wjg-cfr8
No affected components available
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/passwdshould pop out.
Screenshots
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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