FreeBSD 'sendfile(2)' Write-Only File Permission Security Bypass Vulnerability

BID:27789

Info

FreeBSD 'sendfile(2)' Write-Only File Permission Security Bypass Vulnerability

Bugtraq ID: 27789
Class: Access Validation Error
CVE: CVE-2008-0777
Remote: No
Local: Yes
Published: Feb 14 2008 12:00AM
Updated: Feb 14 2008 10:26PM
Credit: Kostik Belousov is credited with the discovery of this vulnerability.
Vulnerable: FreeBSD FreeBSD 7.0
FreeBSD FreeBSD 6.3
FreeBSD FreeBSD 6.2
FreeBSD FreeBSD 5.5
Not Vulnerable:

Discussion

FreeBSD 'sendfile(2)' Write-Only File Permission Security Bypass Vulnerability

FreeBSD is prone to a security-bypass vulnerability because the kernel fails to validate file permissions.

Attackers can exploit this issue to obtain sensitive information that may lead to further attacks.

Exploit / POC

FreeBSD 'sendfile(2)' Write-Only File Permission Security Bypass Vulnerability

To exploit this issue, an attacker would only need to create a program that invokes the 'sendfile(2)' system call.

Solution / Fix

FreeBSD 'sendfile(2)' Write-Only File Permission Security Bypass Vulnerability

Solution:
The vendor released patches and an advisory to address this issue. Please see the references for more information.


FreeBSD FreeBSD 6.2

FreeBSD FreeBSD 5.5

FreeBSD FreeBSD 6.3

FreeBSD FreeBSD 7.0

References

FreeBSD 'sendfile(2)' Write-Only File Permission Security Bypass Vulnerability

References:

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