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Skype Multiple Buffer Overflow Vulnerabilities
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Secunia Advisory:
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SA17305
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Release Date:
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2005-10-25
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Last Update:
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2006-07-10
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Critical:
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Highly critical
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Impact:
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DoS
System access
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Skype for Linux 0.x
Skype for Linux 1.x
Skype for Mac 0.x
Skype for Mac 1.x
Skype for Pocket PC 1.x
Skype for Windows 1.x
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| | CVE reference: | CVE-2005-3265 (Secunia mirror)
CVE-2005-3267 (Secunia mirror)
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Description:
Some vulnerabilities have been reported in Skype, which can be exploited by malicious people to cause a DoS or to compromise a user's system.
1) A boundary error exists when handling Skype-specific URI types e.g. "callto://" and "skype://". This can be exploited to cause a buffer overflow and allows arbitrary code execution when the user clicks on a specially-crafted Skype-specific URL.
The vulnerability is related to:
SA13191
2) A boundary error exists in the handling of VCARD imports. This can be exploited to cause a buffer overflow and allows arbitrary code execution when the user imports a specially-crafted VCARD.
Vulnerability #1 and #2 has been reported in Skype for Windows Release 1.1.*.0 through 1.4.*.83.
3) An integer overflow error exists when allocating memory in response to certain received Skype client network UDP packet. This can be exploited to cause a heap-based buffer overflow via a specially-crafted UDP packet.
Successful exploitation crashes the Skype client. It has been reported that the vulnerability is also exploitable via TCP and allows arbitrary code execution via overwritten function pointers on the heap.
The vulnerability has been reported in the following versions:
* Skype for Windows Release 1.4.*.83 and prior.
* Skype for Mac OS X Release 1.3.*.16 and prior.
* Skype for Linux Release 1.2.*.17 and prior.
* Skype for Pocket PC Release 1.1.*.6 and prior.
Do you have this product installed on your home computer? Scan using the free Personal Software Inspector. Check if a vulnerable version is installed on computers in your corporate network, using the Network Software Inspector.
Solution:
Update to the fixed version.
http://www.skype.com/download/
Skype for Windows:
Update to Release 1.4.*.84 or later.
Skype for Mac OS X:
Update to Release 1.3.*.17 or later.
Skype for Linux:
Update to Release 1.2.*.18 or later.
Skype for Pocket PC:
Update to Release 1.1.0.20 or later.
Provided and/or discovered by:
1-2) Mark Rowe and Joe Moore, Pentest Limited.
2) Mark Litchfield, NGS Software.
3) EADS/CRC Security Team.
Changelog:
2005-10-25: Updated credit and "Original Advisory" sections.
2005-10-26: Updated "Description" section.
2005-10-26: Vendor releases fixed version for Pocket PC. Updated "Solution Status" and "Solution" sections.
2005-10-27: Added links to US-CERT vulnerability notes.
2005-10-28: Updated credits section.
2006-07-10: Updated credits section.
Original Advisory:
Skype:
http://www.skype.com/security/skype-sb-2005-02.html
http://www.skype.com/security/skype-sb-2005-03.html
Pentest Limited:
http://www.pentest.co.uk/documents/ptl-2005-01.html
Other References:
SA13191:
http://secunia.com/advisories/13191/
US-CERT VU#668193:
http://www.kb.cert.org/vuls/id/668193
US-CERT VU#905177:
http://www.kb.cert.org/vuls/id/905177
US-CERT VU#930345:
http://www.kb.cert.org/vuls/id/930345
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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5 Related Secunia Security Advisories
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1. Skype Cross-Zone Scripting Security Enhancement
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2. Skype URI Argument Handling Format String Vulnerability
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3. Skype URL Handling File Disclosure Vulnerability
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4. Skype "skype_profile.jpg" Insecure Temporary File Creation
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5. Skype "callto:" URI Handler Buffer Overflow Vulnerability
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