Tag
#web
### 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 ) from v3.0.2 to v3.9.0 and v4.0.0, are vulnerable to cross-site scripting (XSS) due to improper neutralization of HTML sanitization. ### Impact Marp Core includes an HTML sanitizer with allowlist support. In the affected versions, the built-in allowlist is enabled by default. When the allowlist is active, if insufficient HTML comments are included, the sanitizer may fail to properly sanitize HTML content and lead cross-site scripting (XSS). ### Patches Marp Core [v3.9.1](https://github.com/marp-team/marp-core/releases/tag/v3.9.1) and [v4.0.1](https://github.com/marp-team/marp-core/releases/tag/v4.0.1) have been patched to fix that. ### Workarounds If you are unable to update the package immediately, disable all HTML tags by setting `html: false` option in the `Marp` class constructor. ```javascript const marp = new Marp({ html: false }) ``` ### References - [CWE-79: Improper Neutralization...
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