phlex makes Cross-site Scripting (XSS) possible due to improper sanitisation of `href` attributes on `<a>` tags

Summary

phlex is an open source framework for building object-oriented views in Ruby. There is a potential cross-site scripting (XSS) vulnerability that can be exploited via maliciously crafted user data. The filter to detect and prevent the use of the `javascript:` URL scheme in the `href` attribute of an `<a>` tag could be bypassed with tab `\t` or newline `\n` characters between the characters of the protocol, e.g. `java\tscript:`. This vulnerability is fixed in 1.10.1, 1.9.2, 1.8.3, 1.7.2, 1.6.3, 1.5.3, and 1.4.2. Configuring a Content Security Policy that does not allow `unsafe-inline` would effectively prevent this vulnerability from being exploited.

Timeline

1. Apr 17, 2024, 3:29 PM UTCCVE published
2. Apr 23, 2024, 6:58 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Aug 2, 2024, 2:13 AM UTCRecord last updated

Affected versions

• phlex-ruby phlex

  From 1.10.0 · fixed in 1.10.1; From 1.9.0 · fixed in 1.9.2; From 1.8.0 · fixed in 1.8.3; From 1.7.0 · fixed in 1.7.2; From 1.6.0 · fixed in 1.6.3; From 1.5.0 · fixed in 1.5.3; From 1.4.0 · fixed in 1.4.2

• phlexRubyGems

  From 1.10.0 · fixed in 1.10.1

• phlexRubyGems

  From 1.9.0 · fixed in 1.9.2

• phlexRubyGems

  From 1.8.0 · fixed in 1.8.3

• phlexRubyGems

  From 1.7.0 · fixed in 1.7.2

• phlexRubyGems

  From 1.6.0 · fixed in 1.6.3

• phlexRubyGems

  From 1.5.0 · fixed in 1.5.3

• phlexRubyGems

  fixed in 1.4.2

References 4