NSFOCUS Security Advisory (SA2009-01) UiTV UiPlayer UiCheck Component Stack Buffer Overflow Vulnerability Release Date: 2009-10-16 CVE ID: CVE-2009-2970 http://www.nsfocus.com/en/advisories/0901.html Affected system: ============== UiTV UiPlayer UiCheck.dll 1.0.0.6 and prior versions Unaffected system: ============== UiTV UiPlayer UiCheck.dll 1.0.0.7 Impact: ====== NSFOCUS Security Team discovered a stack buffer overflow vulnerability in UiPlayer which allows remote attackers to run arbitrary code on user system by crafting a malicious webpage. Description: ========== UiPlayer is a video player provided by UITV. Due to the cooperation with Baibu and other companies, UiPlayer is integrated into many video players, such as BaiduX. UiPlayer is embedded into browsers in the form of ActiveX, and acquires video data in high speed by P2P technique. There exists a vulnerability in a component of UiPlayer, which allows attackers to gain complete control over user's system. UiCheck.dll in UiPlayer's installation directory is an ActiveX control that will be loaded in IE. The interface function GetUiDllVersion() provided by UiCheck.dll will copy the received filename parameter to a buffer of fixed size. If the filename is over-long, it will trigger a stack buffer overflow. Workaround: =========== * Un-register UiCheck.dll by command "regsvr32 /u UiCheck.dll". Vendor Status: ============ The vulnerability has been fixed by the vendor in the latest version, available for download at the vendor's homepage: http://www.uitv.cn/support/index.html BaiduV: http://v.baidu.com/xiaba/index.html Additional Information: ================== The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2009-2970 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. Candidates may change significantly before they become official CVE entries. Credit: ===== This vulnerability was discovered by Yu Yang of NSFOCUS Security Team. DISCLAIMS: THE INFORMATION PROVIDED IS RELEASED BY NSFOCUS "AS IS" WITHOUT WARRANTY OF ANY KIND. NSFOCUS DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, EXCEPT FOR THE WARRANTIES OF MERCHANTABILITY. IN NO EVENT SHALL NSFOCUS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF USINESS PROFITS OR SPECIAL DAMAGES, EVEN IF NSFOCUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. DISTRIBUTION OR REPRODUCTION OF THE INFORMATION IS PROVIDED THAT THE ADVISORY IS NOT MODIFIED IN ANY WAY. (c) 2009 NSFOCUS. -- Regards, NSFOCUS Security Team <security (at) nsfocus (dot) com [email concealed]> NSFOCUS Information Technology Co.,Ltd. (http://www.nsfocus.com) PGP Key fingerprint = F8F2 F5D1 EF74 E08C 02FE 1B90 D7BF 7877 C6A6 F6DA