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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2000.288 -- FreeBSD-SA-00:56 LPRng contains potential root compromise 16 October 2000 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: LPRng Vendor: FreeBSD Ports Collection Operating System: FreeBSD Linux Unix Impact: Root Compromise Access Required: Local or Remote Ref: ESB-2000.274 ESB-2000.275 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= 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 <chris@SCARY.BEASTS.ORG> 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.tgz 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 - -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBOebCc1UuHi5z0oilAQGIrwP+I0aP9pZOMT4FbOar8NpMExmeQXNr74+e euwWeJZszDNe4p0a2yGB9Xn4CrkQZNhwZKUoDzk1K9RrDxNwjwT7gouKMGgn38Lr OIQLi2FZqgT0cbnGusdK4sxbQZl2AnPkEunQOskeXhCbZX97wMQOjDid72ZXxNAR l+KW/XexpuQ= =Ew7y - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the original authors to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: firstname.lastname@example.org Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for emergencies. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBOlSNACh9+71yA2DNAQHy7AP/QgQA1LCbnkbwePsoP9NvKm6CpDpeyGYG 6er+m5fbpo+M5P6EVjtlgn4mWi3/XmaJ6DiANKCTilhRxTXQZ9nPm/3GUOzkmnnv c/24lQhHrB5JyLDfbJoz1eN72eKQsHAeKb0y6mivVHbKYWOp6UCQAv94mIXDqnj0 1U873Cs8HJI= =4TrR -----END PGP SIGNATURE-----