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rpc.py vulnerable to Deserialization of Untrusted Data

Critical severity GitHub Reviewed Published Jul 9, 2022 to the GitHub Advisory Database • Updated Apr 22, 2024

Package

pip rpc.py (pip)

Affected versions

>= 0.4.2, <= 0.6.0

Patched versions

None

Description

rpc.py through 0.6.0 allows Remote Code Execution because an unpickle occurs when the "serializer: pickle" HTTP header is sent. In other words, although JSON (not Pickle) is the default data format, an unauthenticated client can cause the data to be processed with unpickle.

Per the maintainer, rpc.py is not designed for an API that is open to the outside world, and external requests cannot reach rpc.py in real world use.

A fix exists on the master branch. As a workaround, use the following code to turn off pickle in older versions:

del SERIALIZER_NAMES[PickleSerializer.name]
del SERIALIZER_TYPES[PickleSerializer.content_type]
### References
- https://nvd.nist.gov/vuln/detail/CVE-2022-35411
- https://github.com/abersheeran/rpc.py/commit/491e7a841ed9a754796d6ab047a9fb16e23bf8bd
- https://github.com/ehtec/rpcpy-exploit
- https://medium.com/@elias.hohl/remote-code-execution-0-day-in-rpc-py-709c76690c30
- https://github.com/abersheeran/rpc.py/issues/22
- http://packetstormsecurity.com/files/167872/rpc.py-0.6.0-Remote-Code-Execution.html
- https://medium.com/%40elias.hohl/remote-code-execution-0-day-in-rpc-py-709c76690c30
Published by the National Vulnerability Database Jul 8, 2022
Published to the GitHub Advisory Database Jul 9, 2022
Reviewed Jul 12, 2022
Last updated Apr 22, 2024

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

13.989%
(96th percentile)

Weaknesses

CVE ID

CVE-2022-35411

GHSA ID

GHSA-8rq8-f485-7v8x

Source code

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