Due to improper type validation in the socket.io-parser library (which is used by the socket.io and socket.io-client packages to encode and decode Socket.IO packets), it is possible to overwrite the _placeholder object which allows an attacker to place references to functions at arbitrary places in the resulting query object.
Example:
const decoder = new Decoder();
decoder.on("decoded", (packet) => {
console.log(packet.data); // prints [ 'hello', [Function: splice] ]
})
decoder.add('51-["hello",{"_placeholder":true,"num":"splice"}]');
decoder.add(Buffer.from("world"));
This bubbles up in the socket.io package:
io.on("connection", (socket) => {
socket.on("hello", (val) => {
// here, "val" could be a function instead of a buffer
});
});
:warning: IMPORTANT NOTE :warning:
You need to make sure that the payload that you received from the client is actually a Buffer object:
If that's already the case, then you are not impacted by this issue, and there is no way an attacker could make your server crash (or escalate privileges, ...).
Example of values that could be sent by a malicious user:
This PR contains the following updates:
4.0.4
->4.0.5
GitHub Vulnerability Alerts
CVE-2022-2421
Due to improper type validation in the
socket.io-parser
library (which is used by thesocket.io
andsocket.io-client
packages to encode and decode Socket.IO packets), it is possible to overwrite the _placeholder object which allows an attacker to place references to functions at arbitrary places in the resulting query object.Example:
This bubbles up in the
socket.io
package::warning: IMPORTANT NOTE :warning:
You need to make sure that the payload that you received from the client is actually a
Buffer
object:If that's already the case, then you are not impacted by this issue, and there is no way an attacker could make your server crash (or escalate privileges, ...).
Example of values that could be sent by a malicious user:
Sample packet:
451-["hello",{"_placeholder":true,"num":10}]
undefined
Sample packet:
451-["hello",{"_placeholder":true,"num":undefined}]
Array
, like "push"Sample packet:
451-["hello",{"_placeholder":true,"num":"push"}]
Object
, like "hasOwnProperty"Sample packet:
451-["hello",{"_placeholder":true,"num":"hasOwnProperty"}]
This should be fixed by:
socket.io-parser@4.2.1
socket.io-parser@4.0.5
socket.io-parser@3.4.2
socket.io-parser@3.3.3
Dependency analysis for the
socket.io
packagesocket.io
versionsocket.io-parser
version4.5.2...latest
~4.2.0
(ref)4.1.3...4.5.1
~4.0.4
(ref)3.0.5...4.1.2
~4.0.3
(ref)3.0.0...3.0.4
~4.0.1
(ref)2.3.0...2.5.0
~3.4.0
(ref)Dependency analysis for the
socket.io-client
packagesocket.io-client
versionsocket.io-parser
version4.5.0...latest
~4.2.0
(ref)4.3.0...4.4.1
~4.1.1
(ref)3.1.0...4.2.0
~4.0.4
(ref)3.0.5
~4.0.3
(ref)3.0.0...3.0.4
~4.0.1
(ref)2.2.0...2.5.0
~3.3.0
(ref)Configuration
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