x86：BTC/SRSO 修复不完全有效 (CVE-2023-46836)

CVE编号

CVE-2023-46836

利用情况

暂无

补丁情况

N/A

披露时间

2024-01-06

漏洞描述

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.

解决建议

建议您更新当前系统或软件至最新版，完成漏洞的修复。

参考链接
https://xenbits.xenproject.org/xsa/advisory-446.html

受影响软件情况

#	类型	厂商	产品	版本	影响面
1
	运行在以下环境
	系统	alpine_3.15	xen	*		Up to (excluding) 4.15.5-r3
	运行在以下环境
	系统	alpine_3.16	xen	*		Up to (excluding) 4.16.5-r4
	运行在以下环境
	系统	alpine_3.17	xen	*		Up to (excluding) 4.16.5-r4
	运行在以下环境
	系统	alpine_3.18	xen	*		Up to (excluding) 4.17.2-r4
	运行在以下环境
	系统	alpine_3.19	xen	*		Up to (excluding) 4.17.2-r4
	运行在以下环境
	系统	debian_12	xen	*		Up to (excluding) 4.17.2+76-ge1f9cb16e2-1~deb12u1
	运行在以下环境
	系统	fedora_37	xen	*		Up to (excluding) 4.16.5-4.fc37
	运行在以下环境
	系统	fedora_38	xen	*		Up to (excluding) 4.17.2-5.fc38
	运行在以下环境
	系统	fedora_39	xen	*		Up to (excluding) 4.17.2-5.fc39
	运行在以下环境
	系统	opensuse_5.3	xen-libs	*		Up to (excluding) 4.16.5_08-150400.4.40.1
	运行在以下环境
	系统	opensuse_5.4	xen-libs	*		Up to (excluding) 4.16.5_08-150400.4.40.1
	运行在以下环境
	系统	opensuse_Leap_15.4	xen	*		Up to (excluding) 4.16.5_08-150400.4.40.1
	运行在以下环境
	系统	opensuse_Leap_15.5	xen	*		Up to (excluding) 4.17.2_08-150500.3.15.1
	运行在以下环境
	系统	suse_12_SP5	xen	*		Up to (excluding) 4.12.4_42-3.100.1

CVSS3评分 N/A

• 攻击路径 N/A
• 攻击复杂度 N/A
• 权限要求 N/A
• 影响范围 N/A
• 用户交互 N/A
• 可用性 N/A
• 保密性 N/A
• 完整性 N/A

N/A

CWE-ID	漏洞类型

Exp相关链接

- avd.aliyun.com