UnratednpmAmendedPublished
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in ZMarkdown
GHSA-2c83-wfv3-q25f
- Affected
- npm rebber < 5.2.1
- Fixed in
- 5.2.1· Vendor fix available
- Issue
- Impact A Remote Command Execution vulnerability was found in the rebber module, which allowed execution of arbitrary commands. The reported problem came from CodeBlocks, which could be escaped to insert malicious LaTeX. Anyone using rebber without sanitation of code content or a custom macro is impacted by this vulnerability. Here is an example of a Markdown content that will exploit the vulnerability: \end{CodeBlock} \immediate\write18{COMMAND outputrce} \input{outputrce} \begin{CodeBlock}{text} Will insert into the generated LaTeX the result of executing COMMAND on the system. Patches The vulnerability has been patched in version 5.2.1. If impacted, you should update to this version as soon as possible. Workarounds It is possible to mitigate the vulnerability without upgrading by using a custom code macro. Please make sure this custom macro escapes your closing LaTeX sequence. For the example above, use: For more information If you have any questions or comments about this…
Recommended action: Upgrade to 5.2.1 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.