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Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.
KaTeX users who render untrusted mathematical expressions could encounter malicious input using \edef that causes a near-infinite loop, despite setting maxExpand to avoid such loops. This can be used as an availability attack, where e.g. a client rendering another user's KaTeX input will be unable to use the site due to memory overflow, tying up the main thread, or stack overflow.
Patches
Upgrade to KaTeX v0.16.10 to remove this vulnerability.
Workarounds
Forbid inputs containing the substring "\\edef" before passing them to KaTeX.
(There is no easy workaround for the auto-render extension.)
Details
KaTeX supports an option named maxExpand which prevents infinitely recursive macros from consuming all available memory and/or triggering a stack overflow error. However, what counted as an "expansion" is a single macro expanding to any number of tokens. The expand-and-define TeX command \edef can be used to build up an exponential number of tokens using only a linear number of expansions according to this definition, e.g. by repeatedly doubling the previous definition. This has been corrected in KaTeX v0.16.10, where every expanded token in an \edef counts as an expansion.
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KaTeX users who render untrusted mathematical expressions could encounter malicious input using \def or \newcommand that causes a near-infinite loop, despite setting maxExpand to avoid such loops. This can be used as an availability attack, where e.g. a client rendering another user's KaTeX input will be unable to use the site due to memory overflow, tying up the main thread, or stack overflow.
Patches
Upgrade to KaTeX v0.16.10 to remove this vulnerability.
Workarounds
Forbid inputs containing any of the characters ₊₋₌₍₎₀₁₂₃₄₅₆₇₈₉ₐₑₕᵢⱼₖₗₘₙₒₚᵣₛₜᵤᵥₓᵦᵧᵨᵩᵪ⁺⁻⁼⁽⁾⁰¹²³⁴⁵⁶⁷⁸⁹ᵃᵇᶜᵈᵉᵍʰⁱʲᵏˡᵐⁿᵒᵖʳˢᵗᵘʷˣʸᶻᵛᵝᵞᵟᵠᵡ before passing them to KaTeX.
(There is no easy workaround for the auto-render extension.)
Details
KaTeX supports an option named maxExpand which aims to prevent infinitely recursive macros from consuming all available memory and/or triggering a stack overflow error. Unfortunately, support for "Unicode (sub|super)script characters" allows an attacker to bypass this limit. Each sub/superscript group instantiated a separate Parser with its own limit on macro executions, without inheriting the current count of macro executions from its parent. This has been corrected in KaTeX v0.16.10.
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KaTeX users who render untrusted mathematical expressions could encounter malicious input using \includegraphics that runs arbitrary JavaScript, or generate invalid HTML.
Patches
Upgrade to KaTeX v0.16.10 to remove this vulnerability.
Workarounds
Avoid use of or turn off the trust option, or set it to forbid \includegraphics commands.
Forbid inputs containing the substring "\\includegraphics".
Sanitize HTML output from KaTeX.
Details
\includegraphics did not properly quote its filename argument, allowing it to generate invalid or malicious HTML that runs scripts.
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If you have any questions or comments about this advisory:
Code that uses KaTeX's trust option, specifically that provides a function to block-list certain URL protocols, can be fooled by URLs in malicious inputs that use uppercase characters in the protocol. In particular, this can allow for malicious input to generate javascript: links in the output, even if the trust function tries to forbid this protocol via trust: (context) => context.protocol !== 'javascript'.
Patches
Upgrade to KaTeX v0.16.10 to remove this vulnerability.
Workarounds
Allow-list instead of block protocols in your trust function.
Manually lowercase context.protocol via context.protocol.toLowerCase() before attempting to check for certain protocols.
Avoid use of or turn off the trust option.
Details
KaTeX did not normalize the protocol entry of the context object provided to a user-specified trust-function, so it could be a mix of lowercase and/or uppercase letters.
It is generally better to allow-list by protocol, in which case this would normally not be an issue. But in some cases, you might want to block-list, and the KaTeX documentation even provides such an example:
Allow all commands but forbid specific protocol: trust: (context) => context.protocol !== 'file'
Currently KaTeX internally sees file: and File: URLs as different protocols, so context.protocol can be file or File, so the above check does not suffice. A simple workaround would be:
Most URL parsers normalize the scheme to lowercase. For example, RFC3986 says:
Although schemes are case-insensitive, the canonical form is lowercase and documents that specify schemes must do so with lowercase letters. An implementation should accept uppercase letters as equivalent to lowercase in scheme names (e.g., allow "HTTP" as well as "http") for the sake of robustness but should only produce lowercase scheme names for consistency.
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🚨 Your current dependencies have known security vulnerabilities 🚨
This dependency update fixes known security vulnerabilities. Please see the details below and assess their impact carefully. We recommend to merge and deploy this as soon as possible!
Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.
What changed?
✳️ katex (0.13.24 → 0.16.10) · Repo · Changelog
Security Advisories 🚨
🚨 KaTeX's maxExpand bypassed by `\edef`
🚨 KaTeX's maxExpand bypassed by Unicode sub/superscripts
🚨 KaTeX's `\includegraphics` does not escape filename
🚨 KaTeX missing normalization of the protocol in URLs allows bypassing forbidden protocols
Release Notes
Too many releases to show here. View the full release notes.
Commits
See the full diff on Github. The new version differs by more commits than we can show here.
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