varnish-cache varnish-modules 空指针解引用

CVE编号

CVE-2021-28543

利用情况

暂无

补丁情况

官方补丁

披露时间

2021-03-17

漏洞描述

Varnish varnish-modules before 0.17.1 allows remote attackers to cause a denial of service (daemon restart) in some configurations. This does not affect organizations that only install the Varnish Cache product; however, it is common to install both Varnish Cache and varnish-modules. Specifically, an assertion failure or NULL pointer dereference can be triggered in Varnish Cache through the varnish-modules header.append() and header.copy() functions. For some Varnish Configuration Language (VCL) files, this gives remote clients an opportunity to cause a Varnish Cache restart. A restart reduces overall availability and performance due to an increased number of cache misses, and may cause higher load on backend servers.

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://lists.fedoraproject.org/archives/list/[email protected]...
https://varnish-cache.org/security/VSV00006.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
	应用	varnish-cache	varnish-modules	*		Up to (excluding) 0.17.1
	运行在以下环境
	应用	varnish-cache	varnish-modules_klarlack	*		Up to (excluding) 0.17.1
	运行在以下环境
	系统	fedora_34	varnish-modules	*		Up to (excluding) 0.17.1-1.fc34
	运行在以下环境
	系统	fedora_34	varnish-modules-debuginfo	*		Up to (excluding) 0.17.1-1.fc34
	运行在以下环境
	系统	fedora_34	varnish-modules-debugsource	*		Up to (excluding) 0.17.1-1.fc34

阿里云评分 3.6

• 攻击路径 远程
• 攻击复杂度 容易
• 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 官方补丁
• 数据保密性 无影响
• 数据完整性 无影响
• 服务器危害 DoS
• 全网数量 N/A

CWE-ID 漏洞类型 CWE-476 空指针解引用