From: NSFOCUS Security Team <security@nsfocus.com.>
To: [email protected], [email protected],
Date: Mon, 24 Apr 2006 16:37:05 +0800
Subject: NSFOCUS SA2006-03 : IBM AIX rm_mlcache_file Local Race Condition Vulnerability
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NSFOCUS Security Advisory (SA2006-03)
IBM AIX rm_mlcache_file Local Race Condition Vulnerability=20
Release Date: 2006-04-24
CVE ID: CVE-2006-1247
http://www.nsfocus.com/english/homepage/research/0603.htm
Affected systems & software
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
IBM AIX 5.1
IBM AIX 5.2
IBM AIX 5.3
Unaffected systems & software
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Summary
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NSFocus Security Team discovered a local race condition in IBM AIX rm_mlcac=
he_file=20
which could allow a local user to overwrite arbitrary file.
Description
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
rm_mlcache_file shipped with IBM AIX is used to delete some cached files.=20
By default it is set with suid root bit.=20
rm_mlcache_file contains a race condition when processing temporary files w=
hich=20
allows a local attacker to overwrite arbitrary files. Attackers can launch=
=20
attacks by running the program directly, or waiting till root user runs it.
Successful exploitation may result in data loss or DoS, specifically depend=
ing
on the overwritten file.
Workaround
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Remove the execution bit from rm_mlcache_file temporarily:
# chmod 000 /usr/bin/rm_mlcache_file
=20
Vendor Status
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The vendor has released the following APAR patches to fix the vulnerability:
APAR number for AIX 5.1.0: IY82866=20
APAR number for AIX 5.2.0: IY82285
APAR number for AIX 5.3.0: IY82357
=20
AIX 5 APAR patch can be downloaded at:=20
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/rm_mlcache_file_ifix.tar.Z
Additional Information
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The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2006-1247 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
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Yang Jilong of NSFocus Security Team found the vulnerability.
DISCLAIMS
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THE INFORMATION PROVIDED IS RELEASED BY NSFOCUS "AS IS" WITHOUT WARRANTY
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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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