Sourced from The GitHub Security Advisory Database.

Hostname spoofing via backslashes in URL

Impact

If using affected versions to determine a URL's hostname, the hostname can be spoofed by using a backslash (\) character as part of the scheme delimiter, e.g. scheme:/\hostname. 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/path Escaped string: https:/\\expected-example.com/path (JavaScript strings must escape backslash)

Affected versions incorrectly return no hostname. 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.

Patches

Version 1.19.6 is patched against all known payload variants.

References

https://github.com/medialize/URI.js/releases/tag/v1.19.6 (fix for this particular bypass) https://github.com/medialize/URI.js/releases/tag/v1.19.4 (fix for related bypass) https://github.com/medialize/URI.js/releases/tag/v1.19.3 (fix for related bypass) PR #233 (initial fix for backslash handling)

For more information

... (truncated)

Affected versions: < 1.19.6

Sourced from urijs's releases.

1.19.6 (February 13th 2021)

• SECURITY fixing URI.parse() to rewrite \ in scheme delimiter to / as Node and Browsers do - disclosed privately by Yaniv Nizry from the CxSCA AppSec team at Checkmarx

Sourced from urijs's changelog.

1.19.6 (February 13th 2021)

• SECURITY fixing URI.parse() to rewrite \ in scheme delimiter to / as Node and Browsers do - disclosed privately by Yaniv Nizry from the CxSCA AppSec team at Checkmarx

• 46c8ac0 chore(build): bumping to version 1.19.6
• a1ad8bc fix(parse): treat backslash as forwardslash in scheme delimiter
• See full diff in compare view

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