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FreeBSD-SA-00:72                                           Security Advisory

                                                                FreeBSD, Inc.



Topic:          curl client-side vulnerability



Category:       ports

Module:         curl

Announced:      2000-11-20

Credits:        Wichert Akkerman 

Affects:        Ports collection prior to the correction date.

Corrected:      2000-10-30

Vendor status:  Updated version released

FreeBSD only:   NO



I.   Background



curl is a multi-protocol file retrieval tool.



II.  Problem Description



The curl port, versions prior to 7.4.1, allows a client-side exploit

through a buffer overflow in the error handling code.  A malicious ftp

server operator can cause arbitrary code to be executed by the user

running the curl client.



The curl port is not installed by default, nor is it "part of FreeBSD"

as such: it is part of the FreeBSD ports collection, which contains

over 4100 third-party applications in a ready-to-install format.

The ports collections shipped with FreeBSD 3.5.1 and 4.1.1 contain

this problem since it was discovered after the releases, but it was

corrected prior to the release of FreeBSD 4.2.



FreeBSD makes no claim about the security of these third-party

applications, although an effort is underway to provide a security

audit of the most security-critical ports.



III. Impact



Malicious FTP server operators can execute arbitrary code on the local

system when a file is downloaded from this server.



If you have not chosen to install the curl port/package, then your

system is not vulnerable to this problem.



IV.  Workaround



Deinstall the curl port/package, if you you have installed it.



V.   Solution



One of the following:



1) Upgrade your entire ports collection and rebuild the curl port.



2) Deinstall the old package and install a new package dated after the

correction date, obtained from:



http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/ftp/curl-7.4.1.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/ftp/curl-7.4.1.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/ftp/curl-7.4.1.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/ftp/curl-7.4.1.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/ftp/curl-7.4.1.tgz



3) download a new port skeleton for the curl port from:



http://www.freebsd.org/ports/



and use it to rebuild the port.



4) Use the portcheckout utility to automate option (3) above. The

portcheckout port is available in /usr/ports/devel/portcheckout or the

package can be obtained from:



http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/devel/portcheckout-2.0.tgz

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