Credential disclosure via pipelined STARTTLS commands
Published May 29, 2023 · Updated Jan 14, 2025
Command injection in Citadel webcit-926 and earlier allows man-in-the-middle attackers to disclose credentials via pipelined STARTTLS commands. The mail server retains extra plaintext commands received with STLS or STARTTLS, then parses and executes them after the connection enters TLS instead of discarding the buffered input. Exploitation requires interception of a mail client connection during the TLS upgrade and is limited to information exposed through the injected protocol exchange.
Summary
What happened
Command injection in Citadel webcit-926 and earlier allows man-in-the-middle attackers to disclose credentials via pipelined STARTTLS commands. The mail server retains extra plaintext commands received with STLS or STARTTLS, then parses and executes them after the connection enters TLS instead of discarding the buffered input. Exploitation requires interception of a mail client connection during the TLS upgrade and is limited to information exposed through the injected protocol exchange.
The record
- CVE
- CVE-2020-29547
- Published
- May 29, 2023
- Updated
- Jan 14, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-77, T1557
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 29, 2023CVE publishedPublication date reported by the CVE source.
- Jan 14, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
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
- STARTTLS command-injection proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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