[UNIX] Skype Linux Insecure Temporary File Creation

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  Skype Linux Insecure Temporary File Creation
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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


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