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TITLE:
FreeBSD "sendfile" Information Disclosure Security Issue

SECUNIA ADVISORY ID:
SA28928

VERIFY ADVISORY:
http://secunia.com/advisories/28928/

CRITICAL:
Not critical

IMPACT:
Exposure of sensitive information

WHERE:
Local system

OPERATING SYSTEM:
FreeBSD 5.x
http://secunia.com/product/1132/
FreeBSD 6.x
http://secunia.com/product/6778/

DESCRIPTION:
A security issue has been reported in FreeBSD, which potentially can
be exploited by malicious, local users to disclose sensitive
information.

The problem is that the "sendfile" system call does not check the
file descriptor access flags before sending data from a file. This
can be exploited to e.g. open a write-only file and send the data
even if a user has no read access.

Successful exploitation requires that the target file is write-only.

SOLUTION:
Update FreeBSD or apply patches.

2008-02-14 11:45:00 UTC (RELENG_7, 7.0-PRERELEASE)
2008-02-14 11:45:41 UTC (RELENG_7_0, 7.0-RELEASE)
2008-02-14 11:46:08 UTC (RELENG_6, 6.3-STABLE)
2008-02-14 11:46:41 UTC (RELENG_6_3, 6.3-RELEASE-p1)
2008-02-14 11:47:06 UTC (RELENG_6_2, 6.2-RELEASE-p11)
2008-02-14 11:47:39 UTC (RELENG_6_1, 6.1-RELEASE-p23)
2008-02-14 11:49:39 UTC (RELENG_5, 5.5-STABLE)
2008-02-14 11:50:28 UTC (RELENG_5_5, 5.5-RELEASE-p19)

-- Patches --

FreeBSD 6.2, 6.3, and 7.0: 
http://security.FreeBSD.org/patches/SA-08:03/sendfile.patch
http://security.FreeBSD.org/patches/SA-08:03/sendfile.patch.asc

FreeBSD 6.1:
http://security.FreeBSD.org/patches/SA-08:03/sendfile61.patch
http://security.FreeBSD.org/patches/SA-08:03/sendfile61.patch.asc

FreeBSD 5.5:
http://security.FreeBSD.org/patches/SA-08:03/sendfile55.patch
http://security.FreeBSD.org/patches/SA-08:03/sendfile55.patch.asc

PROVIDED AND/OR DISCOVERED BY:
Kostik Belousov

ORIGINAL ADVISORY:
http://security.freebsd.org/advisories/FreeBSD-SA-08:03.sendfile.asc

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About:
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