Sourced from The GitHub Security Advisory Database.

ReDOS vulnerabities: multiple grammars

Impact: Potential ReDOS vulnerabilities (exponential and polynomial RegEx backtracking)

oswasp:

> The Regular expression Denial of Service (ReDoS) is a Denial of Service attack, that exploits the fact that most Regular Expression implementations may reach extreme situations that cause them to work very slowly (exponentially related to input size). An attacker can then cause a program using a Regular Expression to enter these extreme situations and then hang for a very long time.

If are you are using Highlight.js to highlight user-provided data you are possibly vulnerable. On the client-side (in a browser or Electron environment) risks could include lengthy freezes or crashes... On the server-side infinite freezes could occur... effectively preventing users from accessing your app or service (ie, Denial of Service).

This is an issue with grammars shipped with the parser (and potentially 3rd party grammars also), not the parser itself. If you are using Highlight.js with any of the following grammars you are vulnerable. If you are using highlightAuto to detect the language (and have any of these grammars registered) you are vulnerable.

All versions prior to 10.4.1 are vulnerable, including version 9.18.5.

Grammars with exponential backtracking issues:

• c-like (c, cpp, arduino)
• handlebars (htmlbars)
• gams
• perl
• jboss-cli
• r

Affected versions: >= 9.0.0 < 10.4.1

Sourced from The GitHub Security Advisory Database.

Prototype Pollution in highlight.js

Impact

Affected versions of this package are vulnerable to Prototype Pollution. A malicious HTML code block can be crafted that will result in prototype pollution of the base object's prototype during highlighting. If you allow users to insert custom HTML code blocks into your page/app via parsing Markdown code blocks (or similar) and do not filter the language names the user can provide you may be vulnerable.

The pollution should just be harmless data but this can cause problems for applications not expecting these properties to exist and can result in strange behavior or application crashes, i.e. a potential DOS vector.

If your website or application does not render user provided data it should be unaffected.

Patches

Versions 9.18.2 and 10.1.2 and newer include fixes for this vulnerability. If you are using version 7 or 8 you are encouraged to upgrade to a newer release.

Workarounds

Patch your library

Manually patch your library to create null objects for both languages and aliases:

const HLJS = function(hljs) {
</tr></table> ... (truncated)
Affected versions: >= 10.0.0 < 10.1.2

Sourced from highlight.js's releases.

10.5.0 - Holiday Cheer Edition

What's New

Build:

• Add Subresource Integrity digest lists to cdn-assets [Josh Goebel][]
• R and VB.net grammars now ship in our default build (:common) [Josh Goebel][]

Parser:

• add match as sugar for simple begin only matches (#2834) [Josh Goebel][]
• allow illegal to also be an array of regex (#2834) [Josh Goebel][]
• add compilerExtensions allows grammers to influence mode compilation (#2834) [Josh Goebel][]
  • some internal pieces are now simple compiler extensions

New Languages:

• Added 3rd party Red & Rebol grammar to SUPPORTED_LANGUAGES (#2872) [Oldes Huhuman][]

Language grammar improvements:

• enh(cpp): Support C++ pack expansion in function arguments [Martin Dørum][]
• enh(makefile): Add make as an alias (#2883) [tripleee][]
• enh(swift) Improved grammar for strings (#2819) [Steven Van Impe][]
• enh(swift) Grammar improvements (#2908) [Steven Van Impe][]
  • New grammar for keywords and built-ins
  • Added support for operator highlighting
  • New grammar for attributes
  • Added support for quoted identifiers, implicit parameters, and property wrapper projections
  • Support for more complex expressions in string interpolation
• enh(swift) Improved highlighting for types and generic arguments (#2920) [Steven Van Impe][]
• fix(http) avoid recursive sublanguage and tighten rules (#2893) [Josh Goebel][]
• fix(asciidoc): Handle section titles level 5 (#2868) [Vaibhav Chanana][]
• fix(asciidoc): Support unconstrained emphasis syntax (#2869) [Guillaume Grossetie][]
• enh(scheme) Allow [] for argument lists (#2913) [Josh Goebel][]
• enh(vb) Large rework of VB.net grammar (#2808) [Jan Pilzer][]
  • Adds support for Date data types, see (#2775)
  • Adds support for REM comments and fixes ''' doctags (#2875) (#2851)
    • Custom number mode to support VB.net specific number flags
    • Hex (&H), Oct (&O), and binary (&B) prefixes
    • Separating digits with underscores: 90_946
  • Type suffixes: 123UI (unsigned integer)
  • Improves directives detection and adds support for Enable, Disable, and Then keywords
  • Adds more markup tests
• fix(javascript) Empty block-comments break highlighting (#2896) [Jan Pilzer][]
• enh(dart) Fix empty block-comments from breaking highlighting (#2898) [Jan Pilzer][]
• enh(dart) Fix empty doc-comment eating next line [Jan Pilzer][]
• enh(asciidoc) Adds support for unconstrained bold syntax (#2869) [Guillaume Grossetie][]
• enh(c-like) Incorrect highlighting for interger suffix (#2919) [Vaibhav Chanana][]
• enh(properties) Correctly handle trailing backslash (#2922) [Vaibhav Chanana][]

Sourced from highlight.js's changelog.

Version 10.5.0

Build:

• Add Subresource Integrity digest lists to cdn-assets [Josh Goebel][]
• R and VB.net grammars now ship in our default build (:common) [Josh Goebel][]

Parser:

• add match as sugar for simple begin only matches (#2834) [Josh Goebel][]
• allow illegal to also be an array of regex (#2834) [Josh Goebel][]
• add compilerExtensions allows grammers to influence mode compilation (#2834) [Josh Goebel][]
  • some internal pieces are now simple compiler extensions

New Languages:

• Added 3rd party Red & Rebol grammar to SUPPORTED_LANGUAGES (#2872) [Oldes Huhuman][]

Language grammar improvements:

• enh(cpp): Support C++ pack expansion in function arguments [Martin Dørum][]
• enh(makefile): Add make as an alias (#2883) [tripleee][]
• enh(swift) Improved grammar for strings (#2819) [Steven Van Impe][]
• enh(swift) Grammar improvements (#2908) [Steven Van Impe][]
  • New grammar for keywords and built-ins
  • Added support for operator highlighting
  • New grammar for attributes
  • Added support for quoted identifiers, implicit parameters, and property wrapper projections
  • Support for more complex expressions in string interpolation
• enh(swift) Improved highlighting for types and generic arguments (#2920) [Steven Van Impe][]
• fix(http) avoid recursive sublanguage and tighten rules (#2893) [Josh Goebel][]
• fix(asciidoc): Handle section titles level 5 (#2868) [Vaibhav Chanana][]
• fix(asciidoc): Support unconstrained emphasis syntax (#2869) [Guillaume Grossetie][]
• enh(scheme) Allow [] for argument lists (#2913) [Josh Goebel][]
• enh(vb) Large rework of VB.net grammar (#2808) [Jan Pilzer][]
  • Adds support for Date data types, see (#2775)
  • Adds support for REM comments and fixes ''' doctags (#2875) (#2851)
    • Custom number mode to support VB.net specific number flags
    • Hex (&H), Oct (&O), and binary (&B) prefixes
    • Separating digits with underscores: 90_946
  • Type suffixes: 123UI (unsigned integer)
  • Improves directives detection and adds support for Enable, Disable, and Then keywords
  • Adds more markup tests
• fix(javascript) Empty block-comments break highlighting (#2896) [Jan Pilzer][]
• enh(dart) Fix empty block-comments from breaking highlighting (#2898) [Jan Pilzer][]
• enh(dart) Fix empty doc-comment eating next line [Jan Pilzer][]
• enh(asciidoc) Adds support for unconstrained bold syntax (#2869) [Guillaume Grossetie][]
• enh(c-like) Incorrect highlighting for interger suffix (#2919) [Vaibhav Chanana][]
• enh(properties) Correctly handle trailing backslash (#2922) [Vaibhav Chanana][]

• af20048 (chore) release to production
• 3522147 (release) 10.5.0 holiday edition
• 511aa11 (chore) update maintainers guide
• ff34d49 (chore) remove ridiculous Crystal relevance
• 3e0b520 (chore) lint Crystal
• f863bce (chore) ship R and VB.net in :common
• d64fbcd prepare for 10.5 release
• 6c2ff21 (chore) camelCase lint
• eaa1c42 (chore) bump terser
• 82f7a68 (chore) clean up types a bit
• Additional commits viewable in compare view

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