CVE-2023-28807: secure internet Cert Validation Flaw

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.

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CVSS v3.1 Score

5.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness Type (CWE)

CWE-295 CWE-295

Affected Products

Vendor	Product	Versions
zscaler	secure_internet_and_saas_access	< 6.2r.290

References

Other References

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

Frequently Asked Questions

What is CVE-2023-28807? +

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. It has a CVSS v3.1 base score of 5.1 (MEDIUM).

How severe is CVE-2023-28807? +

CVE-2023-28807 has a CVSS v3.1 score of 5.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2023-28807? +

CVE-2023-28807 affects products from zscaler, specifically: secure_internet_and_saas_access. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2023-28807? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2023-28807