Phishing emails via fixed MIME boundary
Published Apr 15, 2021 · Updated Aug 3, 2024
Improper input validation in Sydent before 2.3.0 allows remote authenticated users to send arbitrary emails via invitation requests. The invite-mail templates used a fixed multipart MIME boundary, so attacker-controlled fields could collide with the delimiter and alter message content sent from the Sydent address. The request requires an authenticated low-privilege user and recipient interaction for phishing impact; exploitation does not provide documented server takeover or data disclosure.
Summary
What happened
Improper input validation in Sydent before 2.3.0 allows remote authenticated users to send arbitrary emails via invitation requests. The invite-mail templates used a fixed multipart MIME boundary, so attacker-controlled fields could collide with the delimiter and alter message content sent from the Sydent address. The request requires an authenticated low-privilege user and recipient interaction for phishing impact; exploitation does not provide documented server takeover or data disclosure.
The record
- CVE
- CVE-2021-29432
- Published
- Apr 15, 2021
- Updated
- Aug 3, 2024
- Vendor
- Matrix.org
- Product
- Sydent
- Classifications
- CWE-20, T1566
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 15, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 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?
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- Affected versionversion=< 2.3.0
What conditions does exploitation require?
What is affected?
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
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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