Unauthenticated request relay via attacker-controlled Host header
Published Jan 26, 2021 · Updated Aug 4, 2024
Server-side request forgery in Winmail 6.5 allows remote attackers to make the server send requests to attacker-chosen URLs. When HTTPS is enabled, app.php trusts the key parameter and an attacker-controlled Host header when selecting the outbound request destination. The endpoint requires no authentication; successful exploitation turns the Winmail host into a request relay to destinations reachable from the server.
Summary
What happened
Server-side request forgery in Winmail 6.5 allows remote attackers to make the server send requests to attacker-chosen URLs. When HTTPS is enabled, app.php trusts the key parameter and an attacker-controlled Host header when selecting the outbound request destination. The endpoint requires no authentication; successful exploitation turns the Winmail host into a request relay to destinations reachable from the server.
The record
- CVE
- CVE-2020-23776
- Published
- Jan 26, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-918
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 26, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
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
- winmail_ssrf.docx proof-of-concept attachmentproof of concept · unverified
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Technologies
Your stack
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Your stack
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