Bug 2486407 (CVE-2020-37248)

Summary: CVE-2020-37248 offlineimap: OfflineIMAP: Information disclosure via man-in-the-middle attack due to insecure STARTTLS handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in OfflineIMAP. This vulnerability allows a remote attacker to perform a man-in-the-middle attack by exploiting the client's trust in the server's STARTTLS capability before authentication. This can lead to the attacker taking over the connection and extracting sensitive account credentials in cleartext, resulting in information disclosure.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2486519, 2486520    
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Description OSIDB Bzimport 2026-06-08 16:02:31 UTC 
OfflineIMAP before 8.0.3 trusts the server with their STARTTLS capability prior to authentication, which allows STRIPTLS/man-in-the-middle attacks, taking over the connection and extracting account credentials in cleartext.