Potential hash collision for background jobs could skip queuing them
Package
Server
(Nextcloud)
Affected versions
>= 28.0.0, >= 29.0.0, >= 30.0.0
Patched versions
28.0.10, 29.0.7, 30.0.0
Server
(Nextcloud Enterprise)
>= 28.0.0, >= 29.0.0, >= 30.0.0
28.0.10, 29.0.7, 30.0.0
Impact
MD5 hashes were used to check background jobs for their uniqueness. This increased the chances of a background job with arguments falsely being identified as already existing and not be queued for execution. By changing the Hash to SHA256 the probability was heavily decreased.
Patches
It is recommended that the Nextcloud Server is upgraded to 28.0.10, 29.0.7 or 30.0.0
It is recommended that the Nextcloud Enterprise Server is upgraded to 28.0.10, 29.0.7 or 30.0.0
Workarounds
References
For more information
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