Local Privilege Escalation Vulnerability in Broadcom LSI Soft Modem Driver
CVE-2023-31096

7.8HIGH

Key Information:

Vendor

Broadcom
Status
Lsi Pci-sv92ex Firmware
Vendor
CVE Published:
10 October 2023

What is CVE-2023-31096?

A vulnerability exists in the Broadcom LSI PCI-SV92EX Soft Modem Kernel Driver that allows an attacker to escalate privileges to the SYSTEM level via a stack overflow condition in RTLCopyMemory. This flaw enables exploitation from a medium-integrity process, which can circumvent kernel-level protections, including antivirus and protected process light (PPL) measures. The elevated privileges gained can be utilized in orchestrated ransomware attacks, particularly through bring-your-own-vulnerable-driver (BYOVD) tactics.

References

https://www.broadcom.com
https://cschwarz1.github.io/posts/0x04/

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2023-31096 : Local Privilege Escalation Vulnerability in Broadcom LSI Soft Modem Driver