SYSTEM privilege escalation via unchecked IOCTL copy
Published Oct 10, 2023 · Updated Sep 19, 2024
Stack-based buffer overflow in Broadcom LSI PCI-SV92EX Soft Modem Kernel Driver 2.2.100.1 and earlier allows local users to gain SYSTEM access. The IOCTL 0x1b2150 handler passes an attacker-controlled length to RtlCopyMemory without checking the destination stack-buffer size. A medium-integrity process that can open the AGRSM_xface device can overwrite the kernel return path and execute code as SYSTEM.
Summary
What happened
Stack-based buffer overflow in Broadcom LSI PCI-SV92EX Soft Modem Kernel Driver 2.2.100.1 and earlier allows local users to gain SYSTEM access. The IOCTL 0x1b2150 handler passes an attacker-controlled length to RtlCopyMemory without checking the destination stack-buffer size. A medium-integrity process that can open the AGRSM_xface device can overwrite the kernel return path and execute code as SYSTEM.
The record
- CVE
- CVE-2023-31096
- Published
- Oct 10, 2023
- Updated
- Sep 19, 2024
- Vendor
- Broadcom
- Product
- LSI PCI-SV92EX Soft Modem Kernel Driver
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 10, 2023CVE publishedPublication date reported by the CVE source.
- Sep 19, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.2.100.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- AGRSM64 Kernel Driver LPE proof of conceptfunctional · demonstrated
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Technologies
Your stack
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Your stack
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