GO-2023-2102

Source
https://pkg.go.dev/vuln/GO-2023-2102
Import Source
https://vuln.go.dev/ID/GO-2023-2102.json
Aliases
Related
Published
2023-10-11T16:49:53Z
Modified
2023-12-06T01:03:10.230012Z
Details

A malicious HTTP/2 client which rapidly creates requests and immediately resets them can cause excessive server resource consumption. While the total number of requests is bounded by the http2.Server.MaxConcurrentStreams setting, resetting an in-progress request allows the attacker to create a new request while the existing one is still executing.

With the fix applied, HTTP/2 servers now bound the number of simultaneously executing handler goroutines to the stream concurrency limit (MaxConcurrentStreams). New requests arriving when at the limit (which can only happen after the client has reset an existing, in-flight request) will be queued until a handler exits. If the request queue grows too large, the server will terminate the connection.

This issue is also fixed in golang.org/x/net/http2 for users manually configuring HTTP/2.

The default stream concurrency limit is 250 streams (requests) per HTTP/2 connection. This value may be adjusted using the golang.org/x/net/http2 package; see the Server.MaxConcurrentStreams setting and the ConfigureServer function.

References

Affected packages

Go / stdlib

Package

Name
stdlib

Affected ranges

Type
SEMVER
Events
Introduced
0The exact introduced commit is unknown
Fixed
1.20.10
Introduced
1.21.0-0
Fixed
1.21.3

Ecosystem specific 

{
    "imports": [
        {
            "path": "net/http",
            "symbols": [
                "ListenAndServe",
                "ListenAndServeTLS",
                "Serve",
                "ServeTLS",
                "Server.ListenAndServe",
                "Server.ListenAndServeTLS",
                "Server.Serve",
                "Server.ServeTLS",
                "http2Server.ServeConn",
                "http2serverConn.processHeaders",
                "http2serverConn.runHandler",
                "http2serverConn.serve",
                "http2serverConn.upgradeRequest"
            ]
        }
    ]
}

Go / golang.org/x/net

Package

Name
golang.org/x/net

Affected ranges

Type
SEMVER
Events
Introduced
0The exact introduced commit is unknown
Fixed
0.17.0

Ecosystem specific 

{
    "imports": [
        {
            "path": "golang.org/x/net/http2",
            "symbols": [
                "Server.ServeConn",
                "serverConn.processHeaders",
                "serverConn.runHandler",
                "serverConn.serve",
                "serverConn.upgradeRequest"
            ]
        }
    ]
}