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VMs with security groups allowing all egress traffic cannot access the Internet in 4.23.0.0

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45/100
Issue 类型
缺陷
描述清晰度
需要澄清
活跃度
活跃
技术栈
java

调研方向

未识别出文件、测试或入口点。首先使用允许 0.0.0.0/0 的仅出站安全组重现 4.23.0.0 案例,然后将其与较旧的正常工作版本进行比较,并跟踪安全组的出站路径。当 VM 可以在没有任何入站规则的情况下发起 Internet 连接,且相关回归已由测试覆盖时,即表示完成。

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描述

bug
problem

Description

In CloudStack 4.23.0.0, a VM cannot access the Internet when its security group has egress rules configured, even when the egress rules allow all outbound traffic (0.0.0.0/0).

The same configuration works as expected in older CloudStack versions.

The issue occurs when the security group has egress rules but no ingress rules.

Expected behavior

The VM should be able to initiate outbound connections to the Internet when the security group has an egress rule allowing all traffic.

According to the CloudStack documentation:

If there is no Egress rule in a Security Group, all the outgoing traffic will be allowed.
If there are Egress rules in a Security Group, only the outgoing traffic which match a Egress rule will be allowed.
Only the incoming traffic which match a Ingress rule will be allowed.

Actual behavior

With CloudStack 4.23.0.0:

  • The VM has a security group assigned.
  • The security group has one egress rule allowing ALL outbound traffic.
  • There are no ingress rules.
  • The VM cannot access the Internet.
Image Image
versions

The versions of ACS, hypervisors, storage, network etc..

The steps to reproduce the bug

...

What to do about it?

No response

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