22135 : Multics on HIS 645 Execute Instruction SDW Access Check Bypass
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
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Timeline

Disclosure Date
1974-06-01

Keywords

karg74

Description

Multics contains a flaw that may allow a local attacker to gain elevated privileges. The issue occured when a specific sequence of code was used to bypass the access checking on the 645 machine. This occured when the execute instruction was in certain restricted locations of a segment with at least read-execute (re) permission. The execute instruction then referenced an object instruction in word zero of a second segment with at least R permission. The object instruction indirected through an ITS pointer in the first segment to access a word for reading or writing in a third segment. The third segment was required to be "active"; that is, to have an SDW pointing to a valid page table for the segment. If all these conditions were met precisely, the access control fields in the SDW of the third segment would be ignored and the object instruction permitted to complete without access checks.

Classification

Location: Local Access Required
Attack Type: Input Manipulation
Impact: Loss of Integrity
Exploit: Exploit Public
OSVDB: Security Software

Solution

Currently, there are no known upgrades, patches, or workarounds available to correct this issue.

Products

Multics

Multics on 645

Unknown or Unspecified

References

Related OSVDB ID: 22128 22129 22130 22131 22132 22133 22134 22136
Other Advisory URL: http://cnscenter.future.co.kr/resource/rsc-center/vendor-wp/ibm/RC22534.pdf
http://csrc.nist.gov/publications/history/karg74.pdf
Keyword: karg74

Credit

Unknown or Incomplete

CVSSv2 Score

We currently have no CVSS2 data on this vulnerability. Feel free to suggest it.

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