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Insufficient Verification of Data Authenticity Affecting libcurl package, versions <0:7.61.1-12.100.amzn1

0.0
medium

Snyk CVSS

    Attack Complexity High
    User Interaction Required
    Scope Changed
    Confidentiality High

    Threat Intelligence

    EPSS 0.1% (41st percentile)
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NVD
5.9 medium
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SUSE
5.9 medium
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Red Hat
6.1 medium

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  • Snyk ID SNYK-AMZN201803-LIBCURL-1921000
  • published 16 Nov 2021
  • disclosed 29 Sep 2021
Report a new vulnerability Found a mistake?

Introduced: 29 Sep 2021

CVE-2021-22947 Open this link in a new tab
CWE-345 Open this link in a new tab

How to fix?

Upgrade Amazon-Linux:2018.03 libcurl to version 0:7.61.1-12.100.amzn1 or higher.
This issue was patched in ALAS-2021-1549.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libcurl package and not the libcurl package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2018.03 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.

References