Unauthenticated proxy use via predictable UDP port
Published Jun 7, 2024 · Updated Aug 1, 2024
Improper authentication in Fndroid Clash for Windows 0.20.0 and 0.20.1 allows remote attackers to consume another user's proxy traffic. The proxy retains a predictable UDP port, so forwarded SOCKS traffic reaches and uses the protected proxy without supplying its username or password. The proxy port must be network-reachable; successful exploitation consumes the victim's proxy service and presents traffic under the victim's egress identity.
Summary
What happened
Improper authentication in Fndroid Clash for Windows 0.20.0 and 0.20.1 allows remote attackers to consume another user's proxy traffic. The proxy retains a predictable UDP port, so forwarded SOCKS traffic reaches and uses the protected proxy without supplying its username or password. The proxy port must be network-reachable; successful exploitation consumes the victim's proxy service and presents traffic under the victim's egress identity.
The record
- CVE
- CVE-2024-5732
- Published
- Jun 7, 2024
- Updated
- Aug 1, 2024
- Vendor
- Fndroid
- Product
- Clash for Windows
- Classifications
- CWE-287, T1090
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 7, 2024CVE publishedPublication date reported by the CVE source.
- Aug 1, 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=0.20.0
- Affected versionversion=0.20.1
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.
Public exploit references
- Clash for Windows UDP proxy authentication-bypass proofproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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