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Use After Free Affecting libcurl package, versions <0:7.53.1-16.86.amzn1

low

Snyk CVSS

    Attack Complexity High
    User Interaction Required

    Threat Intelligence

    EPSS 1.54% (87th percentile)
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NVD
9.8 critical
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SUSE
4.3 medium
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Red Hat
5 medium

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  • Snyk ID SNYK-AMZN201803-LIBCURL-1716987
  • published 27 Sep 2021
  • disclosed 31 Oct 2018
Report a new vulnerability Found a mistake?

Introduced: 31 Oct 2018

CVE-2018-16840 Open this link in a new tab
CWE-416 Open this link in a new tab

How to fix?

Upgrade Amazon-Linux:2018.03 libcurl to version 0:7.53.1-16.86.amzn1 or higher.
This issue was patched in ALAS-2019-1148.

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.

A heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle. When closing and cleaning up an 'easy' handle in the Curl_close() function, the library code first frees a struct (without nulling the pointer) and might then subsequently erroneously write to a struct field within that already freed struct.