TITLE:
Skype Multiple Buffer Overflow Vulnerabilities

SECUNIA ADVISORY ID:
SA17305

VERIFY ADVISORY:
http://secunia.com/advisories/17305/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
Skype for Pocket PC 1.x
http://secunia.com/product/4252/
Skype for Mac OS X 1.x
http://secunia.com/product/5980/
Skype for Mac OS X 0.x
http://secunia.com/product/4253/
Skype for Linux 1.x
http://secunia.com/product/5402/
Skype for Linux 0.x
http://secunia.com/product/4251/
Skype for Windows 1.x
http://secunia.com/product/4250/

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) A boundary error exists in the handling of certain unspecified
Skype client network traffic. This can be exploited to cause a
heap-based buffer overflow.

Successful exploitation crashes the Skype client.

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.

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:
No patch is yet available.

PROVIDED AND/OR DISCOVERED BY:
1-2) Mark Rowe, Pentest Limited.
3) Imad Lahoud, EADS Corporate Research Center.

ORIGINAL ADVISORY:
http://www.skype.com/security/skype-sb-2005-02.html
http://www.skype.com/security/skype-sb-2005-03.html

OTHER REFERENCES:
SA13191:
http://secunia.com/advisories/13191/

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