Out-of-bounds Write Affecting curl package, versions <0:7.47.1-9.66.amzn1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-AMZN201803-CURL-1703320
- published27 Sept 2021
- disclosed31 Jul 2018
Introduced: 31 Jul 2018
CVE-2016-8622 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2018.03 curl to version 0:7.47.1-9.66.amzn1 or higher.
This issue was patched in ALAS-2016-766.
NVD Description
Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2018.03 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.
References
- http://www.securityfocus.com/bid/94105
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8622
- https://curl.haxx.se/docs/adv_20161102H.html
- https://www.tenable.com/security/tns-2016-21
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8622
- https://security.gentoo.org/glsa/201701-47
- https://access.redhat.com/errata/RHSA-2018:2486
- https://access.redhat.com/errata/RHSA-2018:3558
- http://www.securitytracker.com/id/1037192