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.
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.
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