Absolute path traversal vulnerability in curl 7.20.0 through 7.21.1, when the --remote-header-name or -J option is used, allows remote servers to create or overwrite arbitrary files by using \ (backslash) as a separator of path components within the Content-disposition HTTP header.

cURL and libcurl 7.18.0 through 7.32.0, when built with OpenSSL, disables the certificate CN and SAN name field verification (CURLOPTSSLVERIFYHOST) when the digital signature verification (CURLOPTSSLVERIFYPEER) is disabled, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.

Heap-based buffer overflow in the curleasyunescape function in lib/escape.c in cURL and libcurl 7.7 through 7.30.0 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted string ending in a "%" (percent) character.

A security flaw was found in the way the library of cURL, an utility for retrieval of files from remote servers, performed match of cookie domain names when making a decision if (previously stored cookies) should be sent to particular domain. Due to a bug in match function implementation, (formerly) the decision / match succeeded also in cases, where just suffix / certain part of the domain name matched the domain name, the current request originated from. A remote attacker could use this flaw to possibly hijack the user session of the victim by submitting a request containing a specially-crafted domain name.

References: [1] http://thread.gmane.org/gmane.comp.web.curl.library/38986

Acknowledgements:

Red Hat would like to thank the cURL project for reporting this issue. Upstream acknowledges YAMADA Yasuharu as the original reporter.

cURL and libcurl 7.10.6 through 7.41.0 does not properly re-use NTLM connections, which allows remote attackers to connect as other users via an unauthenticated request, a similar issue to CVE-2014-0015.

cURL and libcurl 7.10.6 through 7.41.0 do not properly re-use authenticated Negotiate connections, which allows remote attackers to connect as other users via a request.

The (1) mbedconnectstep1 function in lib/vtls/mbedtls.c and (2) polarsslconnectstep1 function in lib/vtls/polarssl.c in cURL and libcurl before 7.49.0, when using SSLv3 or making a TLS connection to a URL that uses a numerical IP address, allow remote attackers to spoof servers via an arbitrary valid certificate.