libcurl is vulnerable to a case of missing out the checking of the certificate CN or SAN name field when the digital signature verification is turned off.
libcurl offers two separate and independent options for verifying a server's
TLS certificate. CURLOPT_SSL_VERIFYPEER
and CURLOPT_SSL_VERIFYHOST
. The
first one tells libcurl to verify the trust chain using a CA cert bundle,
while the second tells libcurl to make sure that the name fields in the
server certificate meets the criteria. Both options are enabled by default.
This flaw had the effect that when an application disabled
CURLOPT_SSL_VERIFYPEER
, libcurl mistakenly also disabled the
CURLOPT_SSL_VERIFYHOST
check. Applications can disable
CURLOPT_SSL_VERIFYPEER
and still achieve security by doing the check on
its own using other means.
The curl command line tool is not affected by this problem as it either enables both options or disables both at the same time.