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CVE-2023-46836— x86: BTC/SRSO fixes not fully effective

Quick assessment

Affected
Xen Xen
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Xen是英国剑桥（Cambridge）大学的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen存在安全漏洞，该漏洞源于BTC/SRSO修复程序未完全有效。

AI Predicted 7.8 Difficulty: Hard EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2023-46836

Vulnerability Information
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Vulnerability Title
x86: BTC/SRSO fixes not fully effective
Source: CVE Program / CVE List V5
Vulnerability Description
The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative Return Stack Overflow) are not IRQ-safe. It was believed that the mitigations always operated in contexts with IRQs disabled. However, the original XSA-254 fix for Meltdown (XPTI) deliberately left interrupts enabled on two entry paths; one unconditionally, and one conditionally on whether XPTI was active. As BTC/SRSO and Meltdown affect different CPU vendors, the mitigations are not active together by default. Therefore, there is a race condition whereby a malicious PV guest can bypass BTC/SRSO protections and launch a BTC/SRSO attack against Xen.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Xen 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xen是英国剑桥（Cambridge）大学的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen存在安全漏洞，该漏洞源于BTC/SRSO修复程序未完全有效。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Xen Xen consult Xen advisory XSA-446 -

II. Public POCs for CVE-2023-46836

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III. Intelligence Information for CVE-2023-46836

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Same Patch Batch · Xen · 2024-01-05 · 10 CVEs total

CVE-2023-46837 arm32: The cache may not be properly cleaned/invalidated (take two)
CVE-2023-46835 x86/AMD: mismatch in IOMMU quarantine page table levels
CVE-2023-34327 x86/AMD: Debug Mask handling
CVE-2023-34328 x86/AMD: Debug Mask handling
CVE-2023-34325 Multiple vulnerabilities in libfsimage disk handling
CVE-2023-34326 x86/AMD: missing IOMMU TLB flushing
CVE-2023-34323 xenstored: A transaction conflict can crash C Xenstored
CVE-2023-34322 top-level shadow reference dropped too early for 64-bit PV guests
CVE-2023-34321 arm32: The cache may not be properly cleaned/invalidated

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2023-46836

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