Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache, and message broker. An integer overflow bug in Redis version 6.0 or newer could be exploited using the `STRALGO LCS` command to corrupt the heap and potentially result with remote code execution. The problem is fixed in version 6.2.3 and 6.0.13. An additional workaround to mitigate the problem without patching the redis-server executable is to use ACL configuration to prevent clients from using the `STRALGO LCS` command.

The version of redis installed on the remote host is prior to 6.2.4-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2REDIS6-2023-008 advisory.

  - Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache, and     message broker. An integer overflow bug in Redis version 6.0 or newer could be exploited using the     `STRALGO LCS` command to corrupt the heap and potentially result with remote code execution. The problem     is fixed in version 6.2.3 and 6.0.13. An additional workaround to mitigate the problem without patching     the redis-server executable is to use ACL configuration to prevent clients from using the `STRALGO LCS`     command. (CVE-2021-29477)

  - Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache, and     message broker. An integer overflow bug in Redis version 6.0 or newer, could be exploited using the     STRALGO LCS command to corrupt the heap and potentially result with remote code execution. This is a     result of an incomplete fix by CVE-2021-29477. The problem is fixed in version 6.2.4 and 6.0.14. An     additional workaround to mitigate the problem without patching the redis-server executable is to use ACL     configuration to prevent clients from using the STRALGO LCS command. On 64 bit systems which have the     fixes of CVE-2021-29477 (6.2.3 or 6.0.13), it is sufficient to make sure that the proto-max-bulk-len     config parameter is smaller than 2GB (default is 512MB). (CVE-2021-32625)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2021:2034 advisory.

  - Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache, and     message broker. An integer overflow bug in Redis version 6.0 or newer could be exploited using the     `STRALGO LCS` command to corrupt the heap and potentially result with remote code execution. The problem     is fixed in version 6.2.3 and 6.0.13. An additional workaround to mitigate the problem without patching     the redis-server executable is to use ACL configuration to prevent clients from using the `STRALGO LCS`     command. (CVE-2021-29477)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote host is affected by the vulnerability described in GLSA-202107-20 (Redis: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Redis. Please review       the CVE identifiers referenced below for details.
  Impact :

    Please review the referenced CVE identifiers for details.
  Workaround :

    There is no known workaround at this time.

The remote CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CESA-2021:2034 advisory.

  - redis: Integer overflow via STRALGO LCS command (CVE-2021-29477)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

An update of the redis package has been released.

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2021-2034 advisory.

    [6.0.9-3]
    - fix integer overflow via STRALGO LCS command       CVE-2021-29477

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

This update for redis fixes the following issues :

redis was updated to 6.0.13 :

CVE-2021-29477: Integer overflow in STRALGO LCS command (bsc#1185729)

CVE-2021-29478: Integer overflow in COPY command for large intsets (bsc#1185730)

Cluster: Skip unnecessary check which may prevent failure detection

Fix performance regression in BRPOP on Redis 6.0

Fix edge-case when a module client is unblocked

redis 6.0.12 :

Fix compilation error on non-glibc systems if jemalloc is not used

redis 6.0.11 :

CVE-2021-21309: Avoid 32-bit overflows when proto-max-bulk-len is set high (bsc#1182657)

Fix handling of threaded IO and CLIENT PAUSE (failover), could lead to data loss or a crash

Fix the selection of a random element from large hash tables

Fix broken protocol in client tracking tracking-redir-broken message

XINFO able to access expired keys on a replica

Fix broken protocol in redis-benchmark when used with -a or

--dbnum

Avoid assertions (on older kernels) when testing arm64 CoW bug

CONFIG REWRITE should honor umask settings

Fix firstkey,lastkey,step in COMMAND command for some commands

RM_ZsetRem: Delete key if empty, the bug could leave empty zset keys

Switch systemd type of the sentinel service from notify to simple.
This can be reverted when updating to 6.2 which fixes https://github.com/redis/redis/issues/7284 .

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:2034 advisory.

    Redis is an advanced key-value store. It is often referred to as a data-structure server since keys can     contain strings, hashes, lists, sets, and sorted sets. For performance, Redis works with an in-memory data     set. You can persist it either by dumping the data set to disk every once in a while, or by appending each     command to a log.

    Security Fix(es):

    * redis: Integer overflow via STRALGO LCS command (CVE-2021-29477)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

This update for redis fixes the following issues :

redis 6.0.13

  - CVE-2021-29477: Integer overflow in STRALGO LCS command     (boo#1185729)

  - CVE-2021-29478: Integer overflow in COPY command for     large intsets (boo#1185730)

  - Cluster: Skip unnecessary check which may prevent     failure detection

  - Fix performance regression in BRPOP on Redis 6.0

  - Fix edge-case when a module client is unblocked

redis 6.0.12 :

  - Fix compilation error on non-glibc systems if jemalloc     is not used

redis 6.0.11 :

  - CVE-2021-21309: Avoid 32-bit overflows when     proto-max-bulk-len is set high (boo#1182657)

  - Fix handling of threaded IO and CLIENT PAUSE (failover),     could lead to data loss or a crash

  - Fix the selection of a random element from large hash     tables

  - Fix broken protocol in client tracking     tracking-redir-broken message

  - XINFO able to access expired keys on a replica

  - Fix broken protocol in redis-benchmark when used with -a     or --dbnum 

  - Avoid assertions (on older kernels) when testing arm64     CoW bug

  - CONFIG REWRITE should honor umask settings

  - Fix firstkey,lastkey,step in COMMAND command for some     commands

  - RM_ZsetRem: Delete key if empty, the bug could leave     empty zset keys 

redis 6.0.10 :

Command behavior changes :

  - SWAPDB invalidates WATCHed keys (#8239)

  - SORT command behaves differently when used on a writable     replica (#8283)

  - EXISTS should not alter LRU (#8016) In Redis 5.0 and 6.0     it would have touched the LRU/LFU of the key.

  - OBJECT should not reveal logically expired keys (#8016)     Will now behave the same TYPE or any other non-DEBUG     command.

  - GEORADIUS[BYMEMBER] can fail with -OOM if Redis is over     the memory limit (#8107)

Other behavior changes :

  - Sentinel: Fix missing updates to the config file after     SENTINEL SET command (#8229)

  - CONFIG REWRITE is atomic and safer, but requires write     access to the config file's folder (#7824, #8051) This     change was already present in 6.0.9, but was missing     from the release notes.

Bug fixes with compatibility implications (bugs introduced in Redis 6.0) :

  - Fix RDB CRC64 checksum on big-endian systems (#8270) If     you're using big-endian please consider the     compatibility implications with RESTORE, replication and     persistence.

  - Fix wrong order of key/value in Lua's map response     (#8266) If your scripts use redis.setresp() or return a     map (new in Redis 6.0), please consider the     implications.

Bug fixes :

  - Fix an issue where a forked process deletes the parent's     pidfile (#8231)

  - Fix crashes when enabling io-threads-do-reads (#8230)

  - Fix a crash in redis-cli after executing cluster backup     (#8267)

  - Handle output buffer limits for module blocked clients     (#8141) Could result in a module sending reply to a     blocked client to go beyond the limit.

  - Fix setproctitle related crashes. (#8150, #8088) Caused     various crashes on startup, mainly on Apple M1 chips or     under instrumentation.

  - Backup/restore cluster mode keys to slots map for     repl-diskless-load=swapdb (#8108) In cluster mode with     repl-diskless-load, when loading failed, slot map     wouldn't have been restored.

  - Fix oom-score-adj-values range, and bug when used in     config file (#8046) Enabling setting this in the config     file in a line after enabling it, would have been buggy.

  - Reset average ttl when empty databases (#8106) Just     causing misleading metric in INFO

  - Disable rehash when Redis has child process (#8007) This     could have caused excessive CoW during BGSAVE,     replication or AOFRW.

  - Further improved ACL algorithm for picking categories     (#7966) Output of ACL GETUSER is now more similar to the     one provided by ACL SETUSER.

  - Fix bug with module GIL being released prematurely     (#8061) Could in theory (and rarely) cause     multi-threaded modules to corrupt memory.

  - Reduce effect of client tracking causing feedback loop     in key eviction (#8100)

  - Fix cluster access to unaligned memory (SIGBUS on old     ARM) (#7958)

  - Fix saving of strings larger than 2GB into RDB files     (#8306)

Additional improvements :

  - Avoid wasteful transient memory allocation in certain     cases (#8286, #5954)

Platform / toolchain support related improvements :

  - Fix crash log registers output on ARM. (#8020)

  - Add a check for an ARM64 Linux kernel bug (#8224) Due to     the potential severity of this issue, Redis will print     log warning on startup.

  - Raspberry build fix. (#8095)

New configuration options :

  - oom-score-adj-values config can now take absolute values     (besides relative ones) (#8046)

Module related fixes :

  - Moved RMAPI_FUNC_SUPPORTED so that it's usable (#8037)

  - Improve timer accuracy (#7987)

  - Allow '\0' inside of result of RM_CreateStringPrintf     (#6260)

redis 6.0.9 :

  - potential heap overflow when using a heap allocator     other than jemalloc or glibc's malloc. Does not affect     the openSUSE package - boo#1178205 

  - Memory reporting of clients argv

  - Add redis-cli control on raw format line delimiter

  - Add redis-cli support for rediss:// -u prefix

  - WATCH no longer ignores keys which have expired for     MULTI/EXEC

  - Correct OBJECT ENCODING response for stream type

  - Allow blocked XREAD on a cluster replica

  - TLS: Do not require CA config if not used

  - multiple bug fixes

  - Additions to modules API

redis 6.0.8 (jsc#PM-1615, jsc#PM-1622, jsc#PM-1681, jsc#ECO-2417, jsc#ECO-2867, jsc#PM-1547, jsc#CAPS-56, jsc#SLE-11578, jsc#SLE-12821) :

  - bug fixes when using with Sentinel

  - bug fixes when using CONFIG REWRITE

  - Remove THP warning when set to madvise

  - Allow EXEC with read commands on readonly replica in     cluster

  - Add masters/replicas options to redis-cli --cluster call     command

  - includes changes from 6.0.7 :

  - CONFIG SET could hung the client when arrives during     RDB/ROF loading

  - LPOS command when RANK is greater than matches responded     with broken protocol

  - Add oom-score-adj configuration option to control Linux     OOM killer

  - Show IO threads statistics and status in INFO output

  - Add optional tls verification mode (see     tls-auth-clients)

redis 6.0.6 :

  - Fix crash when enabling CLIENT TRACKING with prefix

  - EXEC always fails with EXECABORT and multi-state is     cleared

  - RESTORE ABSTTL won't store expired keys into the db

  - redis-cli better handling of non-pritable key names

  - TLS: Ignore client cert when tls-auth-clients off

  - Tracking: fix invalidation message on flush

  - Notify systemd on Sentinel startup

  - Fix crash on a misuse of STRALGO

  - Few fixes in module API

  - Fix a few rare leaks (STRALGO error misuse, Sentinel)

  - Fix a possible invalid access in defrag of scripts

  - Add LPOS command to search in a list

  - Use user+pass for MIGRATE in redis-cli and     redis-benchmark in cluster mode

  - redis-cli support TLS for --pipe, --rdb and --replica     options

  - TLS: Session caching configuration support

redis 6.0.5 :

  - Fix handling of speical chars in ACL LOAD

  - Make Redis Cluster more robust about operation errors     that may lead to two clusters to mix together

  - Revert the sendfile() implementation of RDB transfer

  - Fix TLS certificate loading for chained certificates

  - Fix AOF rewirting of KEEPTTL SET option

  - Fix MULTI/EXEC behavior during -BUSY script errors

Redis project reports : Vulnerability in the STRALGO LCS command An integer overflow bug in Redis version 6.0 or newer could be exploited using the STRALGO LCS command to corrupt the heap and potentially result with remote code execution. Vulnerability in the COPY command for large intsets An integer overflow bug in Redis 6.2 could be exploited to corrupt the heap and potentially result with remote code execution. The vulnerability involves changing the default set-max-intset-entries configuration value, creating a large set key that consists of integer values and using the COPY command to duplicate it. The integer overflow bug exists in all versions of Redis starting with 2.6, where it could result with a corrupted RDB or DUMP payload, but not exploited through COPY (which did not exist before 6.2).

ID	Name	Product	Family	Severity
181948	Amazon Linux 2 : redis (ALASREDIS6-2023-008)	Nessus	Amazon Linux Local Security Checks	high
157734	Rocky Linux 8 : redis:6 (RLSA-2021:2034)	Nessus	Rocky Linux Local Security Checks	high
156975	GLSA-202107-20 : Redis: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
150044	CentOS 8 : redis:6 (CESA-2021:2034)	Nessus	CentOS Local Security Checks	high
150037	Photon OS 4.0: Redis PHSA-2021-4.0-0032	Nessus	PhotonOS Local Security Checks	high
149996	Oracle Linux 8 : redis:6 (ELSA-2021-2034)	Nessus	Oracle Linux Local Security Checks	high
149804	SUSE SLES15 Security Update : redis (SUSE-SU-2021:1652-1)	Nessus	SuSE Local Security Checks	high
149724	RHEL 8 : redis:6 (RHSA-2021:2034)	Nessus	Red Hat Local Security Checks	high
149549	openSUSE Security Update : redis (openSUSE-2021-682)	Nessus	SuSE Local Security Checks	high
149247	FreeBSD : redis -- multiple vulnerabilities (1606b03b-ac57-11eb-9bdd-8c164567ca3c)	Nessus	FreeBSD Local Security Checks	high

Detections

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CVE-2021-29477

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