591 : BSD ex3.7preserve Group ID Privilege Escalation
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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
1985-01-30

Description

BSD contains a flaw that may allow a malicious user to gain access to unauthorized privileges. The issue is triggered when the native bsd C language compiler translates chown(path, owner) in ex3.7preserve as chown(path, owner, 0), which permits the creation of a file in group 0. This flaw may lead to a loss of integrity.

Classification

Location: Local Access Required
Attack Type: Misconfiguration
Impact: Loss of Integrity
Exploit: Exploit Public
OSVDB: Concern

Solution

Currently, there are no known upgrades or patches to correct this issue. It is possible to correct the flaw by implementing the following workaround: modify the chmod system call to not let anyone setgid a file who's group was different from the effective group of the process.

Products

BSDI	BSD	1
		2
		2.11
		3
		4
		4.1

References

Mail List Post: http://securitydigest.org/unix/archive/009

Credit

Andrew Draskoy -

CVSSv2 Score

NVD does not currently have a CVSSv2 score assigned.

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