VDB
KO
MEDIUM

GHSA-w67g-5rqw-f597

Gorilla WebSocket Uses Cryptographically Weak PRNG for WebSocket Mask Key

Quick fix

GHSA-w67g-5rqw-f597 — github.com/gorilla/websocket: upgrade to the fixed version with the command below.

go get github.com/gorilla/websocket@v1.5.3

Details

gorilla/websocket used `math/rand` (cryptographically weak pseudo-random number generator) to generate WebSocket frame mask keys prior to commit d67f4185. WebSocket masking keys MUST be unpredictable to prevent frame content injection attacks. math/rand produces deterministic output when seeded with a known value, enabling an attacker to predict or recover mask keys and inject content into WebSocket connections.

**Type:** Use of Cryptographically Weak Pseudo-Random Number Generator **Fix:** Replaced math/rand with crypto/rand (commit d67f4185, released in v1.5.3) **Credit:** bounty-hunter v6.0 silent-fix detection

Are you affected?

Enter the version of the package you're using.

Affected packages

Go / github.com/gorilla/websocket
Introduced in: 0 Fixed in: 1.5.3
Fix go get github.com/gorilla/websocket@v1.5.3

References