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Out-of-bounds Write Affecting curl package, versions <7.51.0-1

0.0
critical

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 1.27% (86th percentile)
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NVD
9.8 critical
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Red Hat
3.7 low

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  • Snyk ID SNYK-DEBIAN11-CURL-517580
  • published 27 Jun 2018
  • disclosed 31 Jul 2018
Report a new vulnerability Found a mistake?

Introduced: 27 Jun 2018

CVE-2016-8622 Open this link in a new tab
CWE-787 Open this link in a new tab

How to fix?

Upgrade Debian:11 curl to version 7.51.0-1 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:11 relevant fixed versions and status.

The URL percent-encoding decode function in libcurl before 7.51.0 is called curl_easy_unescape. Internally, even if this function would be made to allocate a unscape destination buffer larger than 2GB, it would return that new length in a signed 32 bit integer variable, thus the length would get either just truncated or both truncated and turned negative. That could then lead to libcurl writing outside of its heap based buffer.