From: NSFOCUS Security Team <security@nsfocus.com.>
To: [email protected], [email protected],
Date: Mon, 24 Apr 2006 16:35:17 +0800
Subject: NSFOCUS SA2006-02 : IBM AIX mklvcopy Local Privilege Escalation Vulnerability
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NSFOCUS Security Advisory (SA2006-02)
IBM AIX mklvcopy Local Privilege Escalation Vulnerability=20
Release Date: 2006-04-24
CVE ID: CVE-2006-1246
http://www.nsfocus.com/english/homepage/research/0602.htm
Affected systems & software
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IBM AIX 5.3
Unaffected systems & software
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Summary
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NSFocus Security Team discovered a local privilege escalation vulnerability=
=20
in IBM AIX mklvcopy which allows users of local system group to gain root=20
privilege.
Description
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The mklvcopy shipped with IBM AIX 5.3 is used to increase the number of cop=
ies=20
in each logical partition in LogicalVolume. By default mklvcopy is set with=
=20
suid root bit, and can be run by system group users.
mklvcopy contains a vulnerability when calling external commands, which all=
ows=20
a local attacker to execute arbitrary command as root. Successful exploitat=
ion=20
requires the attacker should gain system group privilege first.=20
Workaround
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Remove suid root bit from mklvocpy.
# chmod a-s /usr/sbin/mklvcopy
=20
Vendor Status
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The vendor has released Patch APAR IY82739 to fix the vulnerability. The re=
lated=20
link is:
http://www-1.ibm.com/support/docview.wss?uid=3Disg1IY82739
AIX 5 APAR Patch can be downloaded at:
http://www.ibm.com/servers/eserver/support/unixservers/aixfixes.html
The temporary patch for the vulnerability can be downloaded at:
ftp://aix.software.ibm.com/aix/efixes/security/mklvcopy_ifix.tar.Z
Additional Information
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The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2006-1246 to this issue. This is a candidate for inclusion in the=
=20
CVE list (http://cve.mitre.org), which standardizes names for security prob=
lems.
Candidates may change significantly before they become official CVE entries.
Acknowledgment
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Yang Jilong of NSFocus Security Team found the vulnerability.
DISCLAIMS
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Copyright 1999-2006 NSFOCUS. All Rights Reserved. Terms of use.
NSFOCUS Security Team <security@nsfocus.com.>
NSFOCUS INFORMATION TECHNOLOGY CO.,LTD
(http://www.nsfocus.com)
PGP Key: http://www.nsfocus.com/homepage/research/pgpkey.asc
Key fingerprint =3D F8F2 F5D1 EF74 E08C 02FE 1B90 D7BF 7877 C6A6 F6DA
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