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Category:   Application (VoIP)  >   Microsoft Skype Vendors:   Skype Technologies
Skype Memory Corruption Error in 'skype4com' URI Handler Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1019056
SecurityTracker URL:
CVE Reference:   CVE-2007-5989   (Links to External Site)
Date:  Dec 7 2007
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 3.6 GOLD
Description:   A vulnerability was reported in Skype. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create specially crafted HTML that, when loaded by the target user, will trigger a memory corruption error in the 'skype4com' URI handler and execute arbitrary code on the target system. The code will run with the privileges of the target user.

The vendor was notified on November 2, 2007.

TippingPoint reported this vulnerability.

The original advisory is available at:

Impact:   A remote user can create HTML that, when loaded by the target user, will execute arbitrary code on the target user's system.
Solution:   The vendor has issued a fixed version (3.6), available as of November 15, 2007.

No vendor advisory had been posted at the time of this entry.

Vendor URL: (Links to External Site)
Cause:   Access control error
Underlying OS:  Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  ZDI-07-070: Skype skype4com URI Handler Remote Heap Corruption

ZDI-07-070: Skype skype4com URI Handler Remote Heap Corruption 
December  6, 2007

-- CVE ID:

-- Affected Vendor:

-- Affected Products:
Skype < 3.6 GOLD

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 5752. 
For further product information on the TippingPoint IPS: 

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Skype. User interaction is required to
exploit this vulnerability in that the target must visit a malicious

The specific flaw exists within the 'skype4com' URI handler created by
Skype during installation. When processing short string values through
this handler an exploitable memory corruption may occur which can
result in arbitrary code execution under the context of the current

-- Vendor Response:
Skype has corrected this issue as of 11/15/2007. All clients updated or
installed as of that date are patched to this issue.

-- Disclosure Timeline:
2007.11.02 - Vulnerability reported to vendor
2007.12.06 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by an anonymous researcher.

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents 
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

The ZDI is unique in how the acquired vulnerability information is used.
3Com does not re-sell the vulnerability details or any exploit code.
Instead, upon notifying the affected product vendor, 3Com provides its
customers with zero day protection through its intrusion prevention
technology. Explicit details regarding the specifics of the
vulnerability are not exposed to any parties until an official vendor
patch is publicly available. Furthermore, with the altruistic aim of
helping to secure a broader user base, 3Com provides this vulnerability
information confidentially to security vendors (including competitors)
who have a vulnerability protection or mitigation product.

CONFIDENTIALITY NOTICE: This e-mail message, including any attachments,
is being sent by 3Com for the sole use of the intended recipient(s) and
may contain confidential, proprietary and/or privileged information.
Any unauthorized review, use, disclosure and/or distribution by any 
recipient is prohibited.  If you are not the intended recipient, please
delete and/or destroy all copies of this message regardless of form and
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