[UNIX] Skype Linux Insecure Temporary File Creation

From: SecuriTeam (support_at_securiteam.com)
Date: 07/18/05

  • Next message: SecuriTeam: "[NT] Internet Explorer's Image Decoder Multiple Vulnerabilities" 
    To: list@securiteam.com
Date: 18 Jul 2005 17:47:16 +0200

    The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
    - - promotion

    The SecuriTeam alerts list - Free, Accurate, Independent.

    Get your security news from a reliable source.
    http://www.securiteam.com/mailinglist.html

    - - - - - - - - -

      Skype Linux Insecure Temporary File Creation
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.skype.com> Skype is "a free program that uses the latest P2P
    technology to bring affordable and high-quality voice communications to
    people all over the world. It also provides a service of Instant
    Messaging".

    Skype creates a temporary file in an insecure way when it adds picture for
    user profile, exploiting this may allow local attackers to preform symlink
    attacks.

    DETAILS

    Vulnerable Systems:
     * Skype for Linux versions 1.1.0.20 and prior

    Each user has his own profile which can be personalized with a picture.
    When a user adds a picture for his profile, Skype creates in /tmp
    directory a file named "skype_profile.jpg" in an insecure manner, without
    checking if the file already exists and if it's a symbolic link.

    bad at badpenguin:~/skype-1.1.0.20$ strace -e trace=open skype

    ========================================

    This bulletin is sent to members of the SecuriTeam mailing list.
    To unsubscribe from the list, send mail with an empty subject line and body to: list-unsubscribe@securiteam.com
    In order to subscribe to the mailing list, simply forward this email to: list-subscribe@securiteam.com

    ====================
    ====================

    DISCLAIMER:
    The information in this bulletin is provided "AS IS" without warranty of any kind.
    In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.

  • Next message: SecuriTeam: "[NT] Internet Explorer's Image Decoder Multiple Vulnerabilities"

    Relevant Pages

    • [NEWS] Skype Buffer Overflow
      ... The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com ... " <http://www.skype.net/> Skype is a little program for making free calls ... execute arbitrary code by exploiting a buffer overflow in Skype. ... unsigned int object_counter; ...
      (Securiteam)
    • [NT] Skype URI Handler Command Switch Parsing
      ... The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com ... Skype client, ... Exploitation occurs when the victim opens the exploit URI in Internet ... This requires the victim to visit a website under the attackers ...
      (Securiteam)
    • [NT] Skype skype4com URI Handler Remote Heap Corruption Vulnerability
      ... The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com ... Skype skype4com URI Handler Remote Heap Corruption Vulnerability ...
      (Securiteam)