sprintf-js Precision Specifier RangeError via toFixed

Executive Summary

sprintf-js through 1.1.3 is vulnerable to a Denial of Service attack due to improper handling of unbounded precision specifiers. The library passes unvalidated precision values to JavaScript's toFixed, toExponential, and toPrecision methods, causing uncaught RangeError exceptions. Attackers can inject excessively large precision values via format strings, crashing applications with minimal payload.

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Detection Guidance

To detect this vulnerability, check if your system uses sprintf-js version 1.1.3 or earlier. In Node.js projects, run 'npm list sprintf-js' or inspect package.json for the version. If the library is present and outdated, the system is vulnerable. No specific network commands are needed as this is a client-side or application-level issue.

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Impact Analysis

This vulnerability can cause applications using sprintf-js to crash, leading to Denial of Service. If sprintf() is called in an asynchronous context, the exception terminates the entire process. Synchronous callers can mitigate this with try/catch blocks, but unpatched applications remain at risk.

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Compliance Impact

This vulnerability primarily causes denial-of-service conditions by crashing applications via uncaught exceptions, which may indirectly impact compliance by disrupting data processing or availability. However, there is no direct evidence that this vulnerability leads to data breaches or unauthorized access, which are key concerns for GDPR or HIPAA. The main risk is service disruption rather than data exposure.

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Mitigation Strategies

Immediately update sprintf-js to version 1.1.4 or later. If updating is not possible, wrap sprintf() calls in try/catch blocks to handle potential RangeError exceptions. Avoid passing untrusted format strings to sprintf-js to prevent exploitation.

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