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MonneratH1:1334763HistorySep 09, 2021 - 2:00 p.m.
curl: CVE-2021-22947: STARTTLS protocol injection via MITM
2021-09-0914:00:44
monnerat
hackerone.com
139
0.001 Low
EPSS
Percentile
41.8%
Summary:
A man-in-the-middle can inject cleartext forged responses to future encrypted commands by pipelining them to the STARTTLS response.
Steps To Reproduce:
Use the attached test case within the curl test system. It is based on IMAP FETCH with explicit TLS. Upon test failure, the downloaded file contains “You’ve been hacked!” rather than the requested mail.
Impact
Mailbox content forgery (IMAP, POP3).
Sent mail content forgery (SMTP).
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