CVE-2016-8625 log

Severity Medium
Remote Yes
Type Insufficient validation
When curl is built with libidn to handle International Domain Names (IDNA), it translates them to puny code for DNS resolving using the IDNA 2003 standard, while IDNA 2008 is the modern and up-to-date IDNA standard. This misalignment causes problems with for example domains using the German ß character (known as the Unicode Character 'LATIN SMALL LETTER SHARP S') which is used at times in the .de TLD and is translated differently in the two IDNA standards, leading to users potentially and unknowingly issuing network transfer requests to the wrong host.

For example, straß is translated into using IDNA 2003 but is translated into using IDNA 2008. Needless to say, those host names could very well resolve to different addresses and be two completely independent servers. IDNA 2008 is mandatory for .de domains.

This name problem exists for DNS-using protocols in curl, but only when built to use libidn.
Group Package Affected Fixed Severity Status Ticket
AVG-66 lib32-libcurl-gnutls 7.50.3-1 7.51.0-1 High Fixed
AVG-65 libcurl-gnutls 7.50.3-1 7.51.0-1 High Fixed
AVG-63 lib32-libcurl-compat 7.50.3-1 7.51.0-1 High Fixed
AVG-62 libcurl-compat 7.50.3-1 7.51.0-1 High Fixed
AVG-61 lib32-curl 7.50.3-1 7.51.0-1 High Fixed
AVG-60 curl 7.50.3-1 7.51.0-1 High Fixed
Date Advisory Group Package Severity Type
03 Nov 2016 ASA-201611-9 AVG-65 libcurl-gnutls High multiple issues
03 Nov 2016 ASA-201611-8 AVG-62 libcurl-compat High multiple issues
03 Nov 2016 ASA-201611-7 AVG-60 curl High multiple issues
02 Nov 2016 ASA-201611-5 AVG-63 lib32-libcurl-compat High multiple issues
02 Nov 2016 ASA-201611-4 AVG-61 lib32-curl High multiple issues
03 Nov 2016 ASA-201611-10 AVG-66 lib32-libcurl-gnutls High multiple issues
curl is not alone with this problem, as there's currently a big flux in the world of network user-agents about which IDNA version to support and use.