CVE-2023-28807

Bypass of ZIA domain fronting detection module through evasion technique

Description

In Zscaler Internet Access (ZIA) a mismatch between Connect Host and Client Hello's Server Name Indication (SNI) enables attackers to evade network security controls by hiding their communications within legitimate traffic.

Category

5.1
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.04%
Affected: Zscaler ZIA
Published at:
Updated at:

References

Link Tags
https://help.zscaler.com/zia/configuring-advanced-settings#domain-fronting product
https://help.zscaler.com/zia/configuring-advanced-settings#dns-optimization product

Frequently Asked Questions

What is the severity of CVE-2023-28807?
CVE-2023-28807 has been scored as a medium severity vulnerability.
How to fix CVE-2023-28807?
To fix CVE-2023-28807, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-28807 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-28807 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-28807?
CVE-2023-28807 affects Zscaler ZIA.
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