ecstatic, a simple static file server middleware, is vulnerable to denial of service. If a payload with a large number of null bytes (%00) is provided by an attacker it can crash ecstatic by running it out of memory.

Results from the original advisory

A payload of 22kB caused a lag of 1 second,
A payload of 35kB caused a lag of 3 seconds,
A payload of 86kB caused the server to crash

Recommendation

Update to version 2.0.0 or later.

References

• https://nvd.nist.gov/vuln/detail/CVE-2016-10703
• jfhbrook/node-ecstatic@71ce939#diff-b2b5a88fb51675f1aa1065c093dce1ee
• GHSA-pm9p-9926-w68m
• https://www.checkmarx.com/advisories/denial-of-service-dos-vulnerability-in-ecstatic-npm-package/
• https://www.npmjs.com/advisories/553
• jfhbrook/node-ecstatic@71ce939
• https://advisory.checkmarx.net/advisory/CX-2016-4450