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GHSA-gg4h-3hg2-grpc
joijoiImpact
Applications are affected only if a schema renames keys with a regular-expression source and a Joi.expression() / Joi.x() target that interpolates the pattern's own match data, combined with { multiple: true }, for example .rename(/^x-(.+)$/, Joi.x('{#1}'), { multiple: true }). Because the target is rendered from the matched input key, an attacker who controls input keys can send x-__proto__ with an object value and make the rename target render as __proto__, which sets the prototype of the object joi returns instead of creating a key on it. The global Object.prototype is not modified, so the effect is confined to the object returned by that one validate() call.
Schemas using a static string rename target are not affected, and neither are schemas left on the default { multiple: false }.
Patches
Versions 17.13.5 and 18.2.4 have been released to address the issue.
Workarounds
- Replace the template rename target with a static string target.
- Keep the template but make the capture unable to produce
__proto__, using a negative lookahead:.rename(/^x-(?!__proto__$)(.+)$/, Joi.x('{#1}'), { multiple: true }) - Drop { multiple: true } from the rename, which stops the rename before the assignment.
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The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the integrity of the data.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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