Improper Certificate Validation

Affecting curl package, versions <7.54.0-r0

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NVD Description

Note: Versions mentioned in the description apply to the upstream curl package. See Remediation section below for Alpine:3.10 relevant versions.

In curl and libcurl 7.52.0 to and including 7.53.1, libcurl would attempt to resume a TLS session even if the client certificate had changed. That is unacceptable since a server by specification is allowed to skip the client certificate check on resume, and may instead use the old identity which was established by the previous certificate (or no certificate). libcurl supports by default the use of TLS session id/ticket to resume previous TLS sessions to speed up subsequent TLS handshakes. They are used when for any reason an existing TLS connection couldn't be kept alive to make the next handshake faster. This flaw is a regression and identical to CVE-2016-5419 reported on August 3rd 2016, but affecting a different version range.

Remediation

Upgrade Alpine:3.10 curl to version 7.54.0-r0 or higher.

References

CVSS Score

7.5
high severity
  • Attack Vector
    Network
  • Attack Complexity
    Low
  • Privileges Required
    None
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    None
  • Integrity
    High
  • Availability
    None
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVE
CVE-2017-7468
CWE
CWE-295
Snyk ID
SNYK-ALPINE310-CURL-454723
Disclosed
16 Jul, 2018
Published
27 Jun, 2018