IBM AIX swcons insecure permissions

aix-swcons-insecure-permissions (38154) The risk level is classified as HighHigh Risk

Description:

The IBM AIX swcons command could allow a local attacker to gain elevated privileges on the system, caused by insecure permissions when redirecting console output. A local attacker with "system" group access could exploit this vulnerability using the -p option to modify files and possibly execute arbitrary commands on the system with root privileges.

*CVSS:

Base Score: 6.9
  Access Vector: Local
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: Complete
  Integrity Impact: Complete
  Availability Impact: Complete
 
Temporal Score: 5.1
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Privileges

Remedy:

For AIX 5.2.0:
Apply APAR IZ03055, available from the IBM Quick Links Web site. See References.

For AIX 5.3.0:
Apply APAR IZ03061, available from the IBM Quick Links Web site. See References.

--OR--

Apply the interim fix for this vulnerability (cfgcon_ifix.tar), available from the IBM AIX FTP site. See References.

References:

  • IBM AIX FTP site: IBM AIX.
  • IBM APAR IZ03055: POTENTIAL SECURITY ISSUE..
  • IBM APAR IZ03061: POTENTIAL SECURITY ISSUE..
  • IBM SECURITY ADVISORY: AIX swcons file ownership/permission vulnerability.
  • iDefense PUBLIC ADVISORY: 10.30.07: IBM AIX swcons Local Arbitrary File Access Vulnerability.
  • BID-26258: IBM AIX Swcons Arbitrary File Access Vulnerability
  • CVE-2007-5804: cfgcon in IBM AIX 5.2 and 5.3 does not properly validate the argument to the -p option to swcons, which allows local users in the system group to create or overwrite an arbitrary file, and enable world writability of this file, by using the file's name as the argument.
  • CVE-2007-5805: cfgcon in IBM AIX 5.2 and 5.3 does not properly validate the argument to the -p option to swcons, which allows local users in the system group to create an arbitrary file, and enable world writability of this file, via a symlink attack involving use of the file's name as the argument. NOTE: this issue is due to an incomplete fix for CVE-2007-5804.
  • OSVDB ID: 40401: IBM AIX cfgcon swcons -p Argument Symlink Local Privilege Escalation
  • OSVDB ID: 47911: IBM AIX swcons Command Local Privilege Escalation
  • SA27437: IBM AIX Multiple Privilege Escalation Vulnerabilities

Platforms Affected:

  • IBM AIX 5.2
  • IBM AIX 5.3

Reported:

Oct 25, 2007

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