CVE-2023-46852: 
Memcached vulnerability analysis and mitigation

A buffer overflow vulnerability (CVE-2023-46852) was discovered in Memcached versions before 1.6.22. The vulnerability exists when processing multiget requests in proxy mode, specifically when there are many spaces after the 'get' substring (NVD).

The vulnerability is classified as a classic buffer overflow (CWE-120) with a CVSS v3.1 base score of 7.5 (HIGH), and vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. The issue occurs when processing requests with excessive spaces after the 'get' command in proxy mode. The exploit requires the request before the first newline to be less than 1024 bytes, with a limit of 100 spaces, and key length checked at 250 bytes (GitHub Patch).

A remote attacker could potentially exploit this vulnerability to cause Memcached to crash, resulting in a denial of service, or possibly execute arbitrary code (Ubuntu Security).

The vulnerability is exploitable when there are up to 772 spaces followed by a key, which can create stack corruption. The request must pass specific checks in try_read_command_proxy, including the requirement that the request before the first newline must be less than 1024 bytes (GitHub Patch).

The vulnerability has been fixed in Memcached version 1.6.22. The fix caps the amount of data pre-key to be reasonable, limiting it to 20 bytes. Users are advised to upgrade to this version or later (Debian Security).