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GHSA-75px-5xx7-5xc7
No affected components available
Summary
protobufjs used plain objects with inherited prototypes for internal type lookup tables used by generated encode and decode functions. If Object.prototype had already been polluted, those lookup tables could resolve attacker-controlled inherited properties as valid protobuf type information.
This could cause attacker-controlled strings to be emitted into generated JavaScript code.
Impact
An attacker who can first trigger a prototype pollution vulnerability may be able to influence generated protobufjs encode or decode functions in a way that can lead to arbitrary JavaScript execution.
This issue requires a separate prototype pollution primitive before protobufjs is invoked.
Applications without a reachable prototype pollution primitive are not directly exploitable through this issue alone.
Preconditions
- The application or one of its dependencies must allow an attacker to pollute
Object.prototype. - The polluted property must affect protobufjs internal type lookup behavior.
- The application must use protobufjs functionality that generates encode or decode code for affected types.
- The generated code path must be reached after the prototype pollution has occurred.
Workarounds
Avoid running affected versions in applications where attacker-controlled input can pollute Object.prototype. If immediate upgrade is not possible, remove or mitigate reachable prototype pollution primitives and isolate schema/message processing from untrusted application state.
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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