Net-Acct temporary file symlink attack

net-acct-tmp-symlink (17283) The risk level is classified as MediumMedium Risk

Description:

Net-Acct creates temporary files insecurely. A local attacker could create a symbolic link from a temporary file to an arbitrary file, which could allow the attacker to create or overwrite files on the system.


Consequences:

File Manipulation

Remedy:

Apply the net-acct-notempfiles patch, available from the Net-Acct Web page. See References.

For Debian GNU/Linux 3.0 (woody):
Upgrade to the latest net-acct package, as listed below. Refer to DSA-559-1 for more information. See References.

Debian GNU/Linux 3.0 (woody): 0.71-5woody1 or later

For other distributions:
Contact your vendor for upgrade or patch information.

References:

  • Net-Acct Web page: Net-Acct.
  • BID-11125: Net-Acct Symbolic Link Vulnerability
  • CVE-2004-0851: The (1) write_list and (2) dump_curr_list functions in Net-Acct before 0.71 allows local users to overwrite arbitrary files via a symlink attack on temporary files.
  • DSA-559: net-acct -- insecure temporary file
  • OSVDB ID: 9750: Net-Acct Insecure Temporary File Creation
  • SA12476: Net-Acct Insecure Temporary File Creation Vulnerability

Platforms Affected:

  • Debian Debian Linux 3.0
  • Ulrich Callmeier Net-Acct 0.71 and prior

Reported:

Sep 07, 2004

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