From: SecuriTeam <support@securiteam.com.>
To: list@securiteam.com
Date: 18 Jul 2005 17:47:16 +0200
Subject: [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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