Advisory Details

July 22nd, 2021

MySQL memcached Plugin Integer Underflow Remote Code Execution Vulnerability

ZDI-21-881
ZDI-CAN-13266

CVE ID CVE-2021-2390
CVSS SCORE 9.8, (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Oracle
AFFECTED PRODUCTS MySQL
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of MySQL. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the processing of Authentication commands in the memcached plugin. The issue results from the lack of proper validation of user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the service account.

ADDITIONAL DETAILS Oracle has issued an update to correct this vulnerability. More details can be found at:
https://www.oracle.com/security-alerts/cpujul2021.html
DISCLOSURE TIMELINE
  • 2021-03-10 - Vulnerability reported to vendor
  • 2021-07-22 - Coordinated public release of advisory
CREDIT Anonymous
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