zulip zulip 使用具有密码学弱点缺陷的prng

CVE编号

CVE-2021-43799

利用情况

暂无

补丁情况

N/A

披露时间

2022-01-26

漏洞描述

Zulip is an open-source team collaboration tool. Zulip Server installs RabbitMQ for internal message passing. In versions of Zulip Server prior to 4.9, the initial installation (until first reboot, or restart of RabbitMQ) does not successfully limit the default ports which RabbitMQ opens; this includes port 25672, the RabbitMQ distribution port, which is used as a management port. RabbitMQ's default "cookie" which protects this port is generated using a weak PRNG, which limits the entropy of the password to at most 36 bits; in practicality, the seed for the randomizer is biased, resulting in approximately 20 bits of entropy. If other firewalls (at the OS or network level) do not protect port 25672, a remote attacker can brute-force the 20 bits of entropy in the "cookie" and leverage it for arbitrary execution of code as the rabbitmq user. They can also read all data which is sent through RabbitMQ, which includes all message traffic sent by users. Version 4.9 contains a patch for this vulnerability. As a workaround, ensure that firewalls prevent access to ports 5672 and 25672 from outside the Zulip server.

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://github.com/gteissier/erl-matter
https://github.com/zulip/zulip/commit/a5496f4098e3998c9b84e8dc564aa983d6cdf6e8
https://github.com/zulip/zulip/releases/tag/4.9
https://github.com/zulip/zulip/security/advisories/GHSA-p663-wxvv-2fjp

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	zulip	zulip	*		Up to (excluding) 4.9

CVSS3评分 9.8

• 攻击路径 网络
• 攻击复杂度 低
• 权限要求 无
• 影响范围 未更改
• 用户交互 无
• 可用性 高
• 保密性 高
• 完整性 高

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CWE-ID 漏洞类型 CWE-338 使用具有密码学弱点缺陷的PRNG