Buffer overflow in Broadcom Lsi Pci-Sv92ex
CVE-2023-31096
An issue was discovered in Broadcom) LSI PCI-SV92EX Soft Modem Kernel Driver through 2.2.100.1 (aka AGRSM64.sys). There is Local Privilege Escalation to SYSTEM via a Stack Overflow in RTLCopyMemory (IOCTL 0x1b2150). An attacker can exploit this to elevate privileges from a medium-integrity process to SYSTEM. This can also be used to bypass kernel-level protections such as AV or PPL, because exploit code runs with high-integrity privileges and can be used in coordinated BYOVD (bring your own vulnerable driver) ransomware campaigns.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (36.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.broadcom.com (Not Applicable)
- cschwarz1.github.io/posts/0x04/ (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2023-31096?
- CVE-2023-31096 is a high-severity vulnerability in Broadcom Lsi Pci-Sv92ex, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2023-10-10.
- How severe is CVE-2023-31096?
- High severity. CVSS v3 base score is 7.8 out of 10.