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- =============================================================================
- CA-93:01 CERT Advisory
- January 13, 1993
- Revised Hewlett-Packard NIS ypbind Vulnerability
-
- -----------------------------------------------------------------------------
-
- *** THIS IS A REVISED CERT ADVISORY ***
- *** IT CONTAINS NEW INFORMATION REGARDING AVAILABILITY OF IMAGE KITS ***
- *** SUPERSEDES CERT ADVISORY CA-92:17 ***
-
- The CERT Coordination Center has received information concerning a
- vulnerability in the NIS ypbind module for the Hewlett-Packard (HP)
- HP/UX Operating System for series 300, 700, and 800 computers.
-
- HP has provided revised patches for all of the HP/UX level 8 releases
- (8.0, 8.02, 8.06, and 8.07). This problem is fixed in HP/UX 9.0.
- The following patches have been superseded:
-
- Patch ID Replaced by Patch ID
- PHNE_1359 PHNE_1706
- PHNE_1360 PHNE_1707
- PHNE_1361 PHNE_1708
-
- All HP NIS clients and servers running ypbind should obtain and
- install the patch appropriate for their machine's architecture
- as described below.
-
- -----------------------------------------------------------------------------
-
- I. Description
-
- A vulnerability in HP NIS allows unauthorized access to NIS data.
-
- II. Impact
-
- Root on a remote host running any vendor's implementation of NIS
- can gain root access on any local host running HP's NIS ypbind.
- Local users of a host running HP's NIS ypbind can also gain root access.
-
- III. Solution
-
- 1) All HP NIS clients and servers running ypbind should obtain and
- install the patch appropriate for their machine's architecture.
-
- These patches contain a version of ypbind that only accepts ypset
- requests from a superuser port on the local host. This prevents
- a non-superuser program from sending rogue ypset requests to ypbind.
- They also include the mod from the superseded patches which prevented
- a superuser on a remote system from issuing a ypset -h command
- to the local system and binding the system to a rogue ypserver.
-
- These patches may be obtained from HP via FTP (this is NOT
- anonymous FTP) or the HP SupportLine. To obtain HP security
- patches, you must first register with the HP SupportLine.
- The registration instructions are available via
- anonymous FTP at cert.org (192.88.209.5) in the file
- "pub/vendors/hp/supportline_and_patch_retrieval".
- The new patch files are:
-
- Architecture Patch ID Filename Checksum
- ------------ -------- -------- --------
- Series 300 PHNE_1706 /hp-ux_patches/s300_400/8.X/PHNE_1706 38955 212
- Series 700 PHNE_1707 /hp-ux_patches/s700/8.X/PHNE_1707 815 311
- Series 800 PHNE_1708 /hp-ux_patches/s800/8.X/PHNE_1708 56971 299
-
- 2) The instructions for installing the patch are provided in the
- PHNE_xxxx.text file (this file is created after the patch has
- been unpacked).
-
- The checksums listed above are for the patch archive files from HP.
- Once unpacked, each shell archive contains additional checksum
- information in the file "patchfilename.text". This checksum is
- applicable to the binary patch file "patchfilename.updt".
-
-
- If you have any questions about obtaining or installing the patches,
- contact the USA HP SupportLine at 415-691-3888, or your local HP
- SupportLine number. Please note that the telephone numbers in this
- advisory are appropriate for the USA and Canada.
-
- -----------------------------------------------------------------------------
- The CERT Coordination Center wishes to thank Brian Kelley of Ford Motor
- Company for bringing this vulnerability to our attention. We would also
- like to thank Hewlett-Packard for their response to this problem.
- -----------------------------------------------------------------------------
-
- If you believe that your system has been compromised, contact the CERT
- Coordination Center or your representative in FIRST (Forum of Incident
- Response and Security Teams).
-
- Internet E-mail: cert@cert.org
- Telephone: 412-268-7090 (24-hour hotline)
- CERT personnel answer 7:30 a.m.-6:00 p.m. EST(GMT-5)/EDT(GMT-4),
- on call for emergencies during other hours.
-
- CERT Coordination Center
- Software Engineering Institute
- Carnegie Mellon University
- Pittsburgh, PA 15213-3890
-
- Past advisories, information about FIRST representatives, and other
- information related to computer security are available for anonymous FTP
- from cert.org (192.88.209.5).
-
-