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- The Computer Incident Advisory Capability
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- _____________________________________________________
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- Information Bulletin
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- May 1, 1991, 1200 PDT Number B-23
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- Ultrix V4.0 and V4.1 Vulnerability
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- PROBLEM: /usr/bin/chroot is installed with the setuid bit set.
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- PLATFORM: DEC Ultrix V4.0 and V4.1, all architectures.
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- DAMAGE: Allows authorized users to gain unauthorized privileges.
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- SOLUTIONS: Fixed in Ultrix V4.2. Manually change file mode of
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- /usr/bin/chroot to 700 for Ultrix V4.0 and V4.1
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- IMPACT OF WORKAROUND: Non-privileged users no longer have access to
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- the chroot command.
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- _______________________________________________________________________
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- Critical /usr/bin/chroot Vulnerability Facts
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- CIAC has been advised of a vulnerability in DEC's Ultrix V4.0 and V4.1
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- operating systems running on all architectures. DEC is aware of this
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- problem, and has corrected it in Ultrix V4.2. The DEC provided fix for
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- Ultrix V4.0 and V4.1 is:
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- (login as root)
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- # chmod 700 /usr/bin/chroot
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- # ls -l /usr/bin/chroot
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- (verify the file protections are "-rwx------")
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- For additional information or assistance, please contact CIAC:
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- Hal Brand
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- (415) 422-6312 or (FTS) 532-6312, or
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- Call CIAC at (415) 422-8193 or (FTS) 532-8193 or
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- send e-mail to ciac@cheetah.llnl.gov.
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- Send FAX messages to: (415) 423-0913 or (FTS) 543-0913
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- _____
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- The CERT/CC and Digital Equipment Corporation provided information
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- contained in this bulletin. This document was prepared as an account
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- of work sponsored by an agency of the United States Government. Neither
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- the United States Government nor the University of California nor any
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- of their employees, makes any warranty, express or implied, or assumes
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- any legal liability or responsibility for the accuracy, completeness,
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- or usefulness of any information, apparatus, product, or process
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- disclosed, or represents that its use would not infringe privately
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- owned rights. Reference herein to any specific commercial products,
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- process, or service by trade name, trademark, manufacturer, or
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- otherwise, does not necessarily constitute or imply its endorsement,
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- recommendation or favoring by the United States Government or the
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- University of California. The views and opinions of authors expressed
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- herein do not necessarily state or reflect those of the United States
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- Government or the University of California, and shall not be used for
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- advertising or product endorsement purposes.
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