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FreeBSD-SA-00:56                                           Security Advisory

                                                                FreeBSD, Inc.



Topic:          LPRng contains potential root compromise



Category:       ports

Module:         LPRng

Announced:      2000-10-13

Credits:        Chris Evans 

Affects:        Ports collection prior to the correction date.

Corrected:      2000-10-13

Vendor status:  Updated version released

FreeBSD only:   NO



I.   Background



LPRng is a popular printer daemon.



II.  Problem Description



The LPRng port, versions prior to 3.6.24, contains a potential

vulnerability which may allow root compromise from both local and

remote systems. The vulnerability is due to incorrect usage of the

syslog(3) function. Local and remote users can send string-formatting

operators to the printer daemon to corrupt the daemon's execution,

potentially gaining root access.



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

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

contains nearly 4000 third-party applications in a ready-to-install

format. The ports collections shipped with FreeBSD 3.5.1, 4.1 and

4.1.1 contain this problem since it was discovered after the releases.



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



Local and remote users may potentially gain root privileges on systems

using LPRng.



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

system is not vulnerable to this problem.



IV.  Workaround



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



V.   Solution



One of the following:



1) Upgrade your entire ports collection and rebuild the LPRng 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/sysutils/LPRng-3.6.25.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/sysutils/LPRng-3.6.25.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/sysutils/LPRng-3.6.25.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/sysutils/LPRng-3.6.25.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/sysutils/LPRng-3.6.25.tgz



NOTE: It may be several days before updated packages are available.



3) download a new port skeleton for the cvsweb 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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