Advisory Details

February 24th, 2021

VMware ESXi SLP Heap-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-21-250
ZDI-CAN-12232

CVE ID CVE-2021-21974
CVSS SCORE 8.8, (AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS VMware
AFFECTED PRODUCTS ESXi
VULNERABILITY DETAILS

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of VMware ESXi. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the processing of SLP messages. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the SLP daemon.

ADDITIONAL DETAILS VMware has issued an update to correct this vulnerability. More details can be found at:
https://www.vmware.com/security/advisories/VMSA-2021-0002.html
DISCLOSURE TIMELINE
  • 2020-10-30 - Vulnerability reported to vendor
  • 2021-02-24 - Coordinated public release of advisory
CREDIT Lucas Leong (@_wmliang_) of Trend Micro's Zero Day Initiative
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