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hackeroneMonneratH1:1334763
HistorySep 09, 2021 - 2:00 p.m.

curl: CVE-2021-22947: STARTTLS protocol injection via MITM

2021-09-0914:00:44
monnerat
hackerone.com
133

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

4.3 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:N/I:P/A:N

0.001 Low

EPSS

Percentile

39.7%

JSON

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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5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

4.3 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:N/I:P/A:N

0.001 Low

EPSS

Percentile

39.7%

JSON
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