Fedora 34: FEDORA-2021-3b267a756c Critical: Redis Integer Overflow Exploit

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.

You can run atomic operations on these types, like appending to a string;

incrementing the value in a hash; pushing to a list; computing set

intersection, union and difference; or getting the member with highest

ranking in a sorted set.

In order to achieve its outstanding performance, Redis works with an

in-memory dataset. Depending on your use case, you can persist it either

by dumping the dataset to disk every once in a while, or by appending

each command to a log.

Redis also supports trivial-to-setup master-slave replication, with very

fast non-blocking first synchronization, auto-reconnection on net split

and so forth.

Other features include Transactions, Pub/Sub, Lua scripting, Keys with a

limited time-to-live, and configuration settings to make Redis behave like

a cache.

You can use Redis from most programming languages also.

**Redis 6.2.3** Released Mon May 3 19:00:00 IST 2021 Upgrade urgency: SECURITY,

Contains fixes to security issues that affect authenticated client connections.

LOW otherwise. Integer overflow in STRALGO LCS command (**CVE-2021-29477**): 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 in remote code

execution. The integer overflow bug exists in all versions of Redis starting

with 6.0. Integer overflow in COPY command for large intsets

(**CVE-2021-29478**): 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). Bug

fixes that are only applicable to previous releases of Redis 6.2: * Fix memory

leak in moduleDefragGlobals (#8853) * Fix memory leak when doing lazy freeing

client tracking table (#8822) * Block abusive replicas from sending command that

could assert and crash redis (#8868) Other bug fixes: * Use a monotonic clock

to check for Lua script timeout (#8812) * redis-cli: Do not use unix socket when

we got redirected in cluster mode (#8870) Modules: * Fix

RM_GetClusterNodeInfo() to correctly populate master id (#8846)

* Tue May 4 2021 Remi Collet - 6.2.3-1

- Upstream 6.2.3 release

[ 1 ] Bug #1957410 - CVE-2021-29477 redis: Integer overflow via STRALGO LCS command

https://bugzilla.redhat.com/show_bug.cgi?id=1957410

[ 2 ] Bug #1957414 - CVE-2021-29478 redis: Integer overflow via COPY command for large intsets

https://bugzilla.redhat.com/show_bug.cgi?id=1957414

su -c 'dnf upgrade --advisory FEDORA-2021-3b267a756c' at the command

line. For more information, refer to the dnf documentation available at

https://dnf.readthedocs.io/en/latest/command_ref.html

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