Redis 6.2.6
Upgrade urgency: SECURITY, contains fixes to security issues.
Security Fixes:
* (CVE-2021-41099) Integer to heap buffer overflow handling certain string
commands and network payloads, when proto-max-bulk-len is manually configured
to a non-default, very large value [reported by yiyuaner].
* (CVE-2021-32762) Integer to heap buffer overflow issue in redis-cli and
redis-sentinel parsing large multi-bulk replies on some older and less common
platforms [reported by Microsoft Vulnerability Research].
* (CVE-2021-32687) Integer to heap buffer overflow with intsets, when
set-max-intset-entries is manually configured to a non-default, very large
value [reported by Pawel Wieczorkiewicz, AWS].
* (CVE-2021-32675) Denial Of Service when processing RESP request payloads with
a large number of elements on many connections.
* (CVE-2021-32672) Random heap reading issue with Lua Debugger [reported by
Meir Shpilraien].
* (CVE-2021-32628) Integer to heap buffer overflow handling ziplist-encoded
data types, when configuring a large, non-default value for
hash-max-ziplist-entries, hash-max-ziplist-value, zset-max-ziplist-entries
or zset-max-ziplist-value [reported by sundb].
* (CVE-2021-32627) Integer to heap buffer overflow issue with streams, when
configuring a non-default, large value for proto-max-bulk-len and
client-query-buffer-limit [reported by sundb].
* (CVE-2021-32626) Specially crafted Lua scripts may result with Heap buffer
overflow [reported by Meir Shpilraien].
Bug fixes that involve behavior changes:
* GEO* STORE with empty source key deletes the destination key and return 0
Previously it would have returned an empty array like the non-STORE variant.
* PUBSUB NUMPAT replies with number of patterns rather than number of subscriptions
This actually changed in 6.2.0 but was overlooked and omitted from the release notes.
Bug fixes that are only applicable to previous releases of Redis 6.2:
* Fix CLIENT PAUSE, used an old timeout from previous PAUSE
* Fix CLIENT PAUSE in a replica would mess the replication offset
* Add some missing error statistics in INFO errorstats
Other bug fixes:
* Fix incorrect reply of COMMAND command key positions for MIGRATE command
* Fix appendfsync to always guarantee fsync before reply, on MacOS and FreeBSD (kqueue)
* Fix the wrong mis-detection of sync_file_range system call, affecting performance
CLI tools:
* When redis-cli received ASK response, it didn't handle it
Improvements:
* Add latency monitor sample when key is deleted via lazy expire
* Sanitize corrupt payload improvements
* Delete empty keys when loading RDB file or handling a RESTORE command
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