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FreeBSD LPRng Vulnerability
FreeBSD LPRng Vulnerability Privacy and Legal Notice


L-004: FreeBSD LPRng Vulnerability

October 13, 2000 19:00 GMT
PROBLEM:       A vulnerability exists in the 'syslog(3) function of LPRng,
               versions prior to 3.6.24.
PLATFORM:      FreeBSD 3.5.1, 4.1, & 4.1.1
DAMAGE:        Using string-formatting operators a malicious user may
               gain root access.
SOLUTION:      Either remove the software from the system, or apply the patch
               offered by FreeBSD.

VULNERABILITY The risk is LOW. This vulnerability is publicly known, ASSESSMENT: however no incidents have been reported.
[****** Begin FreeBSD Advisory ******] 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: ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/sysutils/LPRng-3.6.25.t ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/sysutils/LPRng-3.6.25.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/sysutils/LPRng-3.6.25.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/sysutils/LPRng-3.6.25.tgz ftp://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: ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5- current/devel/portcheckout-2.0.tgz [****** End FreeBSD Advisory ******]

CIAC wishes to acknowledge the contributions of FreeBSD, Inc. for the information contained in this bulletin.
CIAC services are available to DOE, DOE Contractors, and the NIH. CIAC can be contacted at:
    Voice:          +1 925-422-8193 (7 x 24)
    FAX:            +1 925-423-8002
    STU-III:        +1 925-423-2604
    E-mail:          ciac@llnl.gov
    World Wide Web:  http://www.ciac.org/
                     (same machine -- either one will work)
    Anonymous FTP:   ftp.ciac.org
                     (same machine -- either one will work)

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