SMTP traffic disclosure via weak Diffie-Hellman parameters
Published Jun 11, 2020 · Updated Aug 4, 2024
Inadequate encryption strength in affected CipherMail virtual appliances allows man-in-the-middle attackers to read protected SMTP traffic. The default Postfix configuration supplies 1024-bit Diffie-Hellman parameters, weakening DHE key exchange for SMTP TLS. Exposure requires mandatory TLS for inter-mailserver SMTP traffic, such as DANE with STARTTLS, and negotiation of Diffie-Hellman key exchange.
Summary
What happened
Inadequate encryption strength in affected CipherMail virtual appliances allows man-in-the-middle attackers to read protected SMTP traffic. The default Postfix configuration supplies 1024-bit Diffie-Hellman parameters, weakening DHE key exchange for SMTP TLS. Exposure requires mandatory TLS for inter-mailserver SMTP traffic, such as DANE with STARTTLS, and negotiation of Diffie-Hellman key exchange.
The record
- CVE
- CVE-2020-12714
- Published
- Jun 11, 2020
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-326, T1557
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 11, 2020CVE 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 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.
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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