FreeBSD : cURL -- Multiple Vulnerability (2438d4af-1538-11e5-a106-3c970e169bc2)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing a security-related update.

Description :

cURL reports :

libcurl can wrongly send HTTP credentials when re-using connections.

libcurl allows applications to set credentials for the upcoming
transfer with HTTP Basic authentication, like with CURLOPT_USERPWD for
example. Name and password. Just like all other libcurl options the
credentials are sticky and are kept associated with the 'handle' until
something is made to change the situation.

Further, libcurl offers a curl_easy_reset() function that resets a
handle back to its pristine state in terms of all settable options. A
reset is of course also supposed to clear the credentials. A reset is
typically used to clear up the handle and prepare it for a new,
possibly unrelated, transfer.

Within such a handle, libcurl can also store a set of previous
connections in case a second transfer is requested to a host name for
which an existing connection is already kept alive.

With this flaw present, using the handle even after a reset would make
libcurl accidentally use those credentials in a subsequent request if
done to the same host name and connection as was previously accessed.

An example case would be first requesting a password protected
resource from one section of a website, and then do a second request
of a public resource from a completely different part of the site
without authentication. This flaw would then inadvertently leak the
credentials in the second request.

libcurl can get tricked by a malicious SMB server to send off data it
did not intend to.

In libcurl's state machine function handling the SMB protocol
(smb_request_state()), two length and offset values are extracted from
data that has arrived over the network, and those values are
subsequently used to figure out what data range to send back.

The values are used and trusted without boundary checks and are just
assumed to be valid. This allows carefully handcrafted packages to
trick libcurl into responding and sending off data that was not
intended. Or just crash if the values cause libcurl to access invalid
memory.

See also :

http://curl.haxx.se/docs/adv_20150617A.html
http://curl.haxx.se/docs/adv_20150617B.html
http://www.nessus.org/u?93278fd4

Solution :

Update the affected package.

Risk factor :

Medium / CVSS Base Score : 6.4
(CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:P)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 84254 ()

Bugtraq ID:

CVE ID: CVE-2015-3236
CVE-2015-3237

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