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TITLE:
FreeBSD pty Snooping Vulnerabilities

SECUNIA ADVISORY ID:
SA28498

VERIFY ADVISORY:
http://secunia.com/advisories/28498/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information

WHERE:
Local system

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

DESCRIPTION:
Some vulnerabilities have been reported in FreeBSD, which can be
exploited by malicious, local users to disclose sensitive
information.

1) An error exists within the implementation of the "openpty()"
function when setting permissions for opened pseudo terminals. This
can be exploited by malicious, local users to read text from a pty
opened by a non root user by executing a program which internally
calls "openpty()" (e.g. "script").

The vulnerability affects FreeBSD 5.0 and later.

2) An error exists within the implementation of the "ptsname()"
function. This can be exploited by malicious, local users to obtain
the ownership of a normally restricted pty by executing pt_chown.

Successful exploitation requires that the attacker has read access on
a device node with a name containing the name of the snooped pty.

The vulnerability affects FreeBSD 6.0 and later.

SOLUTION:
Update FreeBSD or apply patches.

2008-01-14 22:57:45 UTC (RELENG_7, 7.0-PRERELEASE)
2008-01-14 22:55:54 UTC (RELENG_7_0, 7.0-RC2)
2008-01-14 22:56:05 UTC (RELENG_6, 6.3-PRERELEASE)
2008-01-14 22:56:18 UTC (RELENG_6_3, 6.3-RELEASE)
2008-01-14 22:56:44 UTC (RELENG_6_2, 6.2-RELEASE-p10)
2008-01-14 22:56:56 UTC (RELENG_6_1, 6.1-RELEASE-p22)
2008-01-14 22:57:06 UTC (RELENG_5, 5.5-STABLE)
2008-01-14 22:57:19 UTC (RELENG_5_5, 5.5-RELEASE-p18)

Patches (FreeBSD 5.5, 6.1, 6.2, 6.3, and 7.0):

-- FreeBSD 5.5 --
http://security.FreeBSD.org/patches/SA-08:01/pty5.patch
http://security.FreeBSD.org/patches/SA-08:01/pty5.patch.asc

-- FreeBSD 6.x --
http://security.FreeBSD.org/patches/SA-08:01/pty6.patch
http://security.FreeBSD.org/patches/SA-08:01/pty6.patch.asc

-- FreeBSD 7.0 --
http://security.FreeBSD.org/patches/SA-08:01/pty7.patch
http://security.FreeBSD.org/patches/SA-08:01/pty7.patch.asc

PROVIDED AND/OR DISCOVERED BY:
The vendor credits John Baldwin.

ORIGINAL ADVISORY:
http://security.freebsd.org/advisories/FreeBSD-SA-08:01.pty.asc

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
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http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
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