Insufficient Verification of Data Authenticity Affecting curl package, versions <7.52.1-5+deb9u16


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.09% (40th percentile)

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  • Snyk IDSNYK-DEBIAN9-CURL-1585145
  • published15 Sept 2021
  • disclosed29 Sept 2021

Introduced: 15 Sep 2021

CVE-2021-22947  (opens in a new tab)
CWE-345  (opens in a new tab)

How to fix?

Upgrade Debian:9 curl to version 7.52.1-5+deb9u16 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Debian. See How to fix? for Debian:9 relevant fixed versions and status.

When curl >= 7.20.0 and <= 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches. curl would then upgrade to TLS but not flush the in-queue of cached responses but instead continue using and trustingthe responses it got before the TLS handshake as if they were authenticated.Using this flaw, it allows a Man-In-The-Middle attacker to first inject the fake responses, then pass-through the TLS traffic from the legitimate server and trick curl into sending data back to the user thinking the attacker's injected data comes from the TLS-protected server.

CVSS Scores

version 3.1