TITLE:
FreeBSD OPIE opiepasswd User Verification Vulnerability

SECUNIA ADVISORY ID:
SA19347

VERIFY ADVISORY:
http://secunia.com/advisories/19347/

CRITICAL:
Less critical

IMPACT:
Security Bypass, Privilege escalation

WHERE:
>From remote

OPERATING SYSTEM:
FreeBSD 6.x
http://secunia.com/product/6778/
FreeBSD 5.x
http://secunia.com/product/1132/
FreeBSD 4.x
http://secunia.com/product/139/

DESCRIPTION:
A vulnerability has been reported in FreeBSD, which can be exploited
by malicious, local users to gain escalated privileges or by
malicious users to bypass certain security restrictions.

The vulnerability is caused due to the use of the "getlogin()"
function by opiepasswd to identify the user it is running as. In
certain cases, "getlogin()" may identify the user as "root" even when
it is being run by an unprivileged user. This can exploited by an
unprivileged user to configure OPIE authentication for the root
user.

Note: The vulnerability can potentially be exploited remotely if the
system is configured with a CGI script that calls opiepasswd.

The vulnerability has been reported in all FreeBSD versions.

SOLUTION:
Update FreeBSD or apply patch.

Fixed versions:
2006-03-22 16:01:08 UTC (RELENG_6, 6.1-STABLE)
2006-03-22 16:01:38 UTC (RELENG_6_0, 6.0-RELEASE-p6)
2006-03-22 16:01:56 UTC (RELENG_5, 5.5-STABLE)
2006-03-22 16:02:17 UTC (RELENG_5_4, 5.4-RELEASE-p13)
2006-03-22 16:02:35 UTC (RELENG_5_3, 5.3-RELEASE-p28)
2006-03-22 16:02:49 UTC (RELENG_4, 4.11-STABLE)
2006-03-22 16:03:05 UTC (RELENG_4_11, 4.11-RELEASE-p16)
2006-03-22 16:03:25 UTC (RELENG_4_10, 4.10-RELEASE-p22)

Patch for FreeBSD 4.10, 4.11, 5.3, 5.4, and 6.0:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:12/opie.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:12/opie.patch.asc

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Mykola Zubach.

ORIGINAL ADVISORY:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:12.opie.asc

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