A weakness has been reported in cURL, which can be exploited by malicious people to conduct spoofing attacks.
The weakness is caused due to the GSS/Negotiate feature unconditionally performing credential delegation, which allows a server to obtain the client's security credentials. This can be exploited by a malicious server to impersonate the client to any other server using the same GSSAPI mechanism.
Successful exploitation requires tricking a user into connecting to a malicious server using the GSS/Negotiate feature.
The weakness is reported in versions 7.10.6 through 7.21.6.
Solution: Update to version 7.21.7 or apply patch.
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