ALAS2023-2025-950


Amazon Linux 2023 Security Advisory: ALAS2023-2025-950
Advisory Released Date: 2025-04-29
Advisory Updated Date: 2025-04-29
Severity: Important

Issue Overview:

Redis is an open source, in-memory database that persists on disk. In versions starting at 2.6 and prior to 7.4.3, An unauthenticated client can cause unlimited growth of output buffers, until the server runs out of memory or is killed. By default, the Redis configuration does not limit the output buffer of normal clients (see client-output-buffer-limit). Therefore, the output buffer can grow unlimitedly over time. As a result, the service is exhausted and the memory is unavailable. When password authentication is enabled on the Redis server, but no password is provided, the client can still cause the output buffer to grow from "NOAUTH" responses until the system will run out of memory. This issue has been patched in version 7.4.3. An additional workaround to mitigate this problem without patching the redis-server executable is to block access to prevent unauthenticated users from connecting to Redis. This can be done in different ways. Either using network access control tools like firewalls, iptables, security groups, etc, or enabling TLS and requiring users to authenticate using client side certificates. (CVE-2025-21605)


Affected Packages:

redis6


Issue Correction:
Run dnf update redis6 --releasever 2023.7.20250428 to update your system.

New Packages:
aarch64:
    redis6-devel-6.2.14-2.amzn2023.0.4.aarch64
    redis6-debuginfo-6.2.14-2.amzn2023.0.4.aarch64
    redis6-6.2.14-2.amzn2023.0.4.aarch64
    redis6-debugsource-6.2.14-2.amzn2023.0.4.aarch64

noarch:
    redis6-doc-6.2.14-2.amzn2023.0.4.noarch

src:
    redis6-6.2.14-2.amzn2023.0.4.src

x86_64:
    redis6-debuginfo-6.2.14-2.amzn2023.0.4.x86_64
    redis6-devel-6.2.14-2.amzn2023.0.4.x86_64
    redis6-6.2.14-2.amzn2023.0.4.x86_64
    redis6-debugsource-6.2.14-2.amzn2023.0.4.x86_64