Skype skype4com URI Handler Remote Heap Corruption Vulnerability

Advisory Content :

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

Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-07-070.html

December 6, 2007

-- CVE ID:

CVE-2007-5989

-- Affected Vendor:

Skype

-- 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:

http://www.tippingpoint.com

-- 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

page.

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

user.

-- 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:

http://www.zerodayinitiative.com

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

any included attachments and notify 3Com immediately by contacting the

sender via reply e-mail or forwarding to 3Com at postmaster (at) 3com (dot)
com. [email concealed]

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Skype skype4com URI Handler Remote Heap Corruption Vulnerability