Description

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.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html

http://www.securityfocus.com/bid/94105

http://www.securitytracker.com/id/1037192

https://access.redhat.com/errata/RHSA-2018:2486

https://access.redhat.com/errata/RHSA-2018:3558

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8622

https://curl.haxx.se/docs/adv_20161102H.html

https://security.gentoo.org/glsa/201701-47

https://www.tenable.com/security/tns-2016-21

Details

Risk Information

CVSS v2

CVSS v3