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ZscalerCVELIST:CVE-2023-28807

HistoryJan 31, 2024 - 7:16 p.m.

CVE-2023-28807 Bypass of ZIA domain fronting detection module through evasion technique

2024-01-3119:16:59

CWE-295

Zscaler

www.cve.org

cve-2023-28807

bypass

zscaler internet access

evasion technique

network security controls

sni

attackers

legitimate traffic

CVSS3

5.1

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

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

EPSS

0.001

Percentile

17.8%

JSON

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.

CNA Affected

[
  {
    "defaultStatus": "unaffected",
    "product": "ZIA",
    "vendor": "Zscaler",
    "versions": [
      {
        "lessThan": "6.2r.290",
        "status": "affected",
        "version": "0",
        "versionType": "custom"
      }
    ]
  }
]

References

help.zscaler.com/zia/configuring-advanced-settings#dns-optimization

help.zscaler.com/zia/configuring-advanced-settings#domain-fronting

CVSS3

5.1

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

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

EPSS

0.001

Percentile

17.8%

JSON

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