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Out-of-bounds Write Affecting curl package, versions <7.51.0-r0

Severity

 Recommended
0.0
critical
0
10

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Threat Intelligence

EPSS
1.29% (87th percentile)

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  • Snyk IDSNYK-ALPINE318-CURL-5511828
  • published27 Jun 2018
  • disclosed31 Jul 2018
Report a new vulnerability Found a mistake?

Introduced: 27 Jun 2018

CVE-2016-8622  (opens in a new tab)
CWE-787  (opens in a new tab)
CWE-190  (opens in a new tab)
CWE-122  (opens in a new tab)

How to fix?

Upgrade Alpine:3.18 curl to version 7.51.0-r0 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 Alpine. See How to fix? for Alpine:3.18 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.