Traffic inspection bypass via synthetic IP spoofing
Published Oct 23, 2023 · Updated Sep 11, 2024
Authentication bypass in Zscaler Client Connector before 3.9 on Windows allows adjacent attackers to bypass protected traffic. The client treats a device that spoofs an address in its synthetic IP range as part of the local network, causing traffic to evade enforced routing. Exploitation requires adjacency to the endpoint's network and control of a spoofed synthetic address; the bounded impact is bypass of the connector's traffic protections.
Summary
What happened
Authentication bypass in Zscaler Client Connector before 3.9 on Windows allows adjacent attackers to bypass protected traffic. The client treats a device that spoofs an address in its synthetic IP range as part of the local network, causing traffic to evade enforced routing. Exploitation requires adjacency to the endpoint's network and control of a spoofed synthetic address; the bounded impact is bypass of the connector's traffic protections.
The record
- CVE
- CVE-2023-28803
- Published
- Oct 23, 2023
- Updated
- Sep 11, 2024
- Vendor
- Zscaler
- Product
- Zscaler Client Connector
- Classifications
- CWE-290, T1562.001
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 23, 2023CVE publishedPublication date reported by the CVE source.
- Sep 11, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <3.9
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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