[RELEASE] Redis 6.2.6, 6.0.16 and 5.0.14 are out

[re...@redis.io]

Howdy folks,

Today's releases address a number of security issues as detailed below. You should consider upgrading to mitigate the risk from malicious actors.

• (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].

Redis 6.2.6

Bug fixes that involve behavior changes:

• GEO* STORE with empty source key deletes the destination key and return 0 (#9271)
  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 (#9209)
  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 (#9477)
• Fix CLIENT PAUSE in a replica would mess the replication offset (#9448)
• Add some missing error statistics in INFO errorstats (#9328)

Other bug fixes:

• Fix incorrect reply of COMMAND command key positions for MIGRATE command (#9455)
• Fix appendfsync to always guarantee fsync before reply, on MacOS and FreeBSD (kqueue) (#9416)
• Fix the wrong misdetection of sync_file_range system call, affecting performance (#9371)

CLI tools:

• When redis-cli received ASK response, it didn't handle it (#8930)

Improvements:

• Add latency monitor sample when key is deleted via lazy expire (#9317)
• Sanitize corrupt payload improvements (#9321, #9399)
• Delete empty keys when loading RDB file or handling a RESTORE command (#9297, #9349)

Redis 6.0.16

Other bug fixes:

• Fix appendfsync to always guarantee fsync before reply, on MacOS and FreeBSD (kqueue) (#9416)
• Fix the wrong misdetection of sync_file_range system call, affecting performance (#9371)
• Fix replication issues when repl-diskless-load is used (#9280)

Redis 5.0.14

No additional changes.

Cheers,
The Redis Team

[lafengnan]

Hi Redis Team,

Does team support Redis 3.2.x versions for such security upgrade? 

Thanks,

Chris

[Itamar Haber]

Hello Lafengnan,

The team aims to support the latest two major versions only, so versions 3 and 4 are no longer maintained. You can read more about the project's releases at https://redis.io/topics/releases.

Cheers,

Itamar

[lafengnan]

Thank you Itamar.