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CVE-2023-46841— x86: shadow stack vs exceptions from emulation stubs

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 4.14 及之前版本存在安全漏洞，该漏洞源于允许攻击者导致虚拟机管理程序崩溃，从而导致整个主机崩溃。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2023-46841

Vulnerability Information
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Vulnerability Title
x86: shadow stack vs exceptions from emulation stubs
Source: CVE Program / CVE List V5
Vulnerability Description
Recent x86 CPUs offer functionality named Control-flow Enforcement Technology (CET). A sub-feature of this are Shadow Stacks (CET-SS). CET-SS is a hardware feature designed to protect against Return Oriented Programming attacks. When enabled, traditional stacks holding both data and return addresses are accompanied by so called "shadow stacks", holding little more than return addresses. Shadow stacks aren't writable by normal instructions, and upon function returns their contents are used to check for possible manipulation of a return address coming from the traditional stack. In particular certain memory accesses need intercepting by Xen. In various cases the necessary emulation involves kind of replaying of the instruction. Such replaying typically involves filling and then invoking of a stub. Such a replayed instruction may raise an exceptions, which is expected and dealt with accordingly. Unfortunately the interaction of both of the above wasn't right: Recovery involves removal of a call frame from the (traditional) stack. The counterpart of this operation for the shadow stack was missing.
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 4.14 及之前版本存在安全漏洞，该漏洞源于允许攻击者导致虚拟机管理程序崩溃，从而导致整个主机崩溃。
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-451 -

II. Public POCs for CVE-2023-46841

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III. Intelligence Information for CVE-2023-46841

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Mailing List Discussions for CVE-2023-46841 (1)

Other References for CVE-2023-46841 (1)

Same Patch Batch · Xen · 2024-03-20 · 3 CVEs total

CVE-2023-46839 pci: phantom functions assigned to incorrect contexts
CVE-2023-46840 VT-d: Failure to quarantine devices in !HVM builds

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2023-46841

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