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Out-of-Bounds Affecting libcurl package, versions <0:7.61.1-9.amzn2.0.1

Severity

 Recommended
0.0
medium
0
10

Based on Amazon Linux security rating

    Threat Intelligence

    EPSS
    2.19% (90th percentile)

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  • Snyk ID SNYK-AMZN2-LIBCURL-1668927
  • published 27 Sep 2021
  • disclosed 31 Oct 2017
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Introduced: 31 Oct 2017

CVE-2017-1000257 Open this link in a new tab
CWE-119 Open this link in a new tab

How to fix?

Upgrade Amazon-Linux:2 libcurl to version 0:7.61.1-9.amzn2.0.1 or higher.
This issue was patched in ALAS2-2019-1162.

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:2 relevant fixed versions and status.

An IMAP FETCH response line indicates the size of the returned data, in number of bytes. When that response says the data is zero bytes, libcurl would pass on that (non-existing) data with a pointer and the size (zero) to the deliver-data function. libcurl's deliver-data function treats zero as a magic number and invokes strlen() on the data to figure out the length. The strlen() is called on a heap based buffer that might not be zero terminated so libcurl might read beyond the end of it into whatever memory lies after (or just crash) and then deliver that to the application as if it was actually downloaded.