低危 ubuntu_18.04.5_lts linux 跨界内存读

CVE编号

CVE-2021-3600

利用情况

暂无

补丁情况

没有补丁

披露时间

2021-06-23

漏洞描述

A flaw was found in the Linux kernel’s eBPF verification code, where the eBPF 32-bit div/mod source register truncation could lead to out-of-bounds reads and writes. By default, accessing the eBPF verifier is only possible to privileged users with CAP_SYS_ADMIN. This flaw allows a local user who can run eBPF instructions to crash the system or possibly escalate their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

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://lore.kernel.org/patchwork/patch/1379497/
https://www.openwall.com/lists/oss-security/2021/06/23/1

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	anolis_os_7	kernel	*		Up to (excluding) 4.19
	运行在以下环境
	系统	anolis_os_8	kernel	*		Up to (excluding) 4.19
	运行在以下环境
	系统	centos_8	kernel	*		Up to (excluding) 4.18.0-348.el8
	运行在以下环境
	系统	debian_10	linux	*		Up to (excluding) 4.19.208-1
	运行在以下环境
	系统	debian_11	linux	*		Up to (excluding) 5.10.19-1
	运行在以下环境
	系统	debian_12	linux	*		Up to (excluding) 5.10.19-1
	运行在以下环境
	系统	debian_9	linux-4.19	*		Up to (excluding) 4.19.208-1~deb9u1
	运行在以下环境
	系统	debian_sid	linux	*		Up to (excluding) 5.10.19-1
	运行在以下环境
	系统	kylinos_aarch64_V10SP2	kernel	*		Up to (excluding) 4.19.90-25.11.v2101.ky10
	运行在以下环境
	系统	kylinos_x86_64_V10SP2	kernel	*		Up to (excluding) 4.19.90-25.11.v2101.ky10
	运行在以下环境
	系统	oracle_8	kernel	*		Up to (excluding) 4.18.0-348.el8
	运行在以下环境
	系统	redhat_8	kernel	*		Up to (excluding) 4.18.0-348.el8
	运行在以下环境
	系统	ubuntu_18.04	linux-hwe-5.4	*		Up to (excluding) 5.4.0-1043.45~18.04.1
	运行在以下环境
	系统	ubuntu_18.04.5_lts	linux	*		Up to (excluding) 4.15.0-147.151
	运行在以下环境
	系统	ubuntu_20.04	linux-bluefield	*		Up to (excluding) 5.4.0-1041.43

阿里云评分 3.3

• 攻击路径 本地
• 攻击复杂度 复杂
• 权限要求 无需权限
• 影响范围 有限影响
• EXP成熟度 N/A
• 补丁情况 没有补丁
• 数据保密性 无影响
• 数据完整性 无影响
• 服务器危害 无影响
• 全网数量 N/A

CWE-ID	漏洞类型
CWE-125	跨界内存读
CWE-787	跨界内存写

Exp相关链接

- avd.aliyun.com