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GHSA-mvrp-3cvx-c325

HighCVSS 7.5 / 10
Published Oct 4, 2023·Last modified Oct 4, 2023
Affected Components(0)

No affected components available

Description

Impact

API servers running express-zod-api having:

  • version of express-zod-api below 10.0.0-beta1,
  • and using the following (or similar) validation schema in its implementation: z.string().email(),

are vulnerable to a DoS attack due to:

  • Inefficient Regular Expression Complexity in zod versions up to 3.22.2,
  • depending on zod.

Patches

The patched version of zod fixing the vulnerability is 3.22.3.

However, it's highly recommended to upgrade express-zod-api to at least version 10.0.0, which does not depend on zod strictly and directly, but requires its installation as a peer dependency instead, enabling you to install the patched zod version yourself.

Workarounds

When it's not possible to upgrade your dependencies, consider the following replacement in your implementation:

- z.string().email()
+ z.string().regex(
+   /^(?!\.)(?!.*\.\.)([A-Z0-9_+-\.]*)[A-Z0-9_+-]@([A-Z0-9][A-Z0-9\-]*\.)+[A-Z]{2,}$/i
+ )

This regular expression is taken from the suggested patch of zod.

References

  • Original issue: https://github.com/colinhacks/zod/issues/2609
  • The patch: https://github.com/colinhacks/zod/pull/2824
  • Entry in database: https://nvd.nist.gov/vuln/detail/CVE-2023-4316
  • Enumeration: https://cwe.mitre.org/data/definitions/1333.html
  • Parent advisory: https://github.com/advisories/GHSA-m95q-7qp3-xv42
  • Changelog entry for express-zod-api version 10.0.0-beta1: https://github.com/RobinTail/express-zod-api/blob/master/CHANGELOG.md#v1000-beta1
Risk Scores
Base Score
7.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. 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 high impact on the availability of the system.

Threat Intelligence
6.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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