URI.js is a javascript URL mutation library (npm package urijs). In URI.js before version 1.19.4, the hostname can be spoofed by using a backslash (`\`) character followed by an at (`@`) character. If the hostname is used in security decisions, the decision may be incorrect. Depending on library usage and attacker intent, impacts may include allow/block list bypasses, SSRF attacks, open redirects, or other undesired behavior. For example the URL `https://expected-example.com\@observed-example.com` will incorrectly return `observed-example.com` if using an affected version. Patched versions correctly return `expected-example.com`. Patched versions match the behavior of other parsers which implement the WHATWG URL specification, including web browsers and Node's built-in URL class. Version 1.19.4 is patched against all known payload variants. Version 1.19.3 has a partial patch but is still vulnerable to a payload variant.]
Affected: npm: urijs
### Impact If using affected versions to determine a URL's hostname, the hostname can be spoofed by using a backslash (`\`) character followed by an at (`@`) character. If the hostname is used in security decisions, the decision may be incorrect.
Depending on library usage and attacker intent, impacts may include allow/block list bypasses, SSRF attacks, open redirects, or other undesired behavior.
Example URL: `https://expected-example.com\@observed-example.com` Escaped string: `https://expected-example.com\\@observed-example.com` (JavaScript strings must escape backslash)
Affected versions incorrectly return `observed-example.com`. Patched versions correctly return `expected-example.com`. Patched versions match the behavior of other parsers which implement the [WHATWG URL specification](https://url.spec.whatwg.org/), including web browsers and [Node's built-in URL class](https://nodejs.org/api/url.html).
### Patches Version 1.19.4 is patched against all known payload variants. Version 1.19.3 has a partial patch but is still vulnerable to a payload variant.
### References https://github.com/medialize/URI.js/releases/tag/v1.19.4 (complete fix for this bypass) https://github.com/medialize/URI.js/releases/tag/v1.19.3 (partial fix for this bypass) [PR #233](https://github.com/medialize/URI.js/pull/233) (initial fix for backslash handling)
### For more information If you have any questions or comments about this advisory, open an issue in https://github.com/medialize/URI.js…
nodejs-debug: Regular expression Denial of Service nodejs-mime: Regular expression Denial of Service nodejs-is-my-json-valid: ReDoS when validating JSON fields with email format nodejs-braces: Regular Expression Denial of Service (ReDoS) in lib/parsers.js lodash: Prototype pollution in utilities function hoek: Prototype pollution in utilities function nodejs-url-parse: incorrect hostname in url parsing nodejs-extend: Prototype pollution can allow attackers to modify object properties nodejs-stringstream: out-of-bounds read leading to uninitialized memory exposure nodejs-handlebars: lookup helper fails to properly validate templates allowing for arbitrary JavaScript execution nodejs-handlebars: an endless loop while processing specially-crafted templates leads to DoS lodash: uncontrolled resource consumption in Data handler causing denial of service nodejs-yargs-parser: prototype pollution vulnerability nodejs-lodash: prototype pollution in zipObjectDeep function nodejs-ajv: prototype pollution via crafted JSON schema in ajv.validate function nodejs-highlight-js: prototype pollution via a crafted HTML code block urijs: Hostname spoofing via backslashes in URL python-pillow: Buffer over-read in PCX image reader python-pillow: decoding crafted YCbCr files could result in heap-based buffer overflow browserslist: parsing of invalid queries could result in Regular Expression Denial of Service (ReDoS) nodejs-postcss: Regular expression denial of service during source map parsing no…