SB2021022402 - Remote code executioin in OpenSLP service in VMware ESXi

Description

This security bulletin contains information about 1 security vulnerability.

1) Heap-based buffer overflow (CVE-ID: CVE-2021-21974)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing packets within the OpenSLP service. A remote non-authenticated attacker on the local network can send specially crafted SLP messages to port 427/tcp, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note, the vulnerability is being actively exploited in the wild.

Remediation

Install update from vendor's website.

References

• https://www.vmware.com/security/advisories/VMSA-2021-0002.html
• https://kb.vmware.com/s/article/76372
• https://www.zerodayinitiative.com/advisories/ZDI-21-250/