[VulnWatch] log4sh insecure temporary file creation

From: ZATAZ Audits (exploits_at_zataz.net)
Date: 07/04/05

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    Date: Mon, 04 Jul 2005 10:17:17 +0200
To: vuldb@securityfocus.com, vuln@secunia.com, vuln@k-otik.com, moderators@osvdb.org, bugs@securitytracker.com, submissions@packetstormsecurity.org, news@securiteam.com, xforce@iss.net, bugtraq@securityfocus.com, vulnwatch@vulnwatch.org, full-disclosure@lists.grok.org.uk

    #########################################################

    log4sh insecure temporary file creation

    Vendor: http://forestent.com/products/log4sh/
    Advisory: http://www.zataz.net/adviso/log4sh-06092005.txt
    Vendor informed: yes
    Exploit available: no
    Impact : low
    Exploitation : low

    #########################################################

    The vulnerabilities are caused due to temporary file being created
    insecurely.
    This can be exploited via symlink attacks in combination to create and
    overwrite
    arbitrary files with the privileges of the user running the affected script.

    ##########
    Versions:
    ##########

    log4sh <= 1.2.5

    ##########
    Solution:
    ##########

    Use kernel patch such as grsecurity

    #########
    Timeline:
    #########

    Discovered : 2005-05-26
    Vendor notified : 2005-06-09
    Vendor response : no reponse
    Vendor fix : no fix
    Vendor Sec report (vendor-sec@lst.de) : 2005-06-27
    Disclosure : 2005-07-04

    #####################
    Technical details :
    #####################

    Vulnerable code :
    -----------------

    356 log4sh_readProperties()
    357 {
    358 _file=$1
    359
    360 _tmpFile="/tmp/log4sh.$$"
    361 grep "^log4sh\." $_file >$_tmpFile

    #########
    Related :
    #########

    Gentoo Bugs report : http://bugs.gentoo.org/show_bug.cgi?id=94069

    #####################
    Credits :
    #####################

    Eric Romang (eromang@zataz.net - ZATAZ Audit)
    Thxs to Gentoo Security Team. (Taviso, jaervosz, solar, tigger, etc.)

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