Risk
8/15/2008
10:56 AM
Randy George
Randy George
Commentary
Connect Directly
LinkedIn
RSS
E-Mail
50%
50%

Cisco Releases Security Advisory On WebEx Client ActiveX Control

According to Cisco, the WebEx Meeting Manager client software includes atucfobj.dll, a DLL that allows meeting participants to view Unicode fonts. This library contains a buffer overflow vulnerability that could allow an attacker to execute arbitrary code on your system. Your WebEx provider must patch its servers in order for you to be protected. Read on to find out how to check.

According to Cisco, the WebEx Meeting Manager client software includes atucfobj.dll, a DLL that allows meeting participants to view Unicode fonts. This library contains a buffer overflow vulnerability that could allow an attacker to execute arbitrary code on your system. Your WebEx provider must patch its servers in order for you to be protected. Read on to find out how to check.WebEx is a leading remote support platform for organizations worldwide, so this particular vulnerability is bound to impact lots of IT shops. In fact, I just discovered my very own Web provider is still vulnerable!

The most frustrating thing about this vulnerability is that you are at the mercy of your WebEx provider. That's because the WebEx provider's server automatically updates the WebEx client upon login to the latest version it has to distribute. And if the WebEx presenter is distributing a vulnerable client, you will be downgraded to a vulnerable client despite any attempt to upgrade to a nonvulnerable client.

Most WebEx presenters are on the WBS26 version of the software. Here's a quick snippet from the Cisco alert that will help you determine if you and your WebEx presenter are vulnerable.

"For the WBS 26 version: 1. Browse to the WebEx meeting server at https://.webex.com/. 2. Select Support from the left side of the Web page. 3. Select Downloads from the left side of the Web page. 4. The version of the client software that is provided by the server is listed next to Client build. For WebEx servers that are running WBS 26, the first fixed version is 26.49.9.2838. Client build versions prior to 26.49.9.2838 are vulnerable."

Of course, my provider is distributing the 26.49.8.2689 client. You can read the full security release here.

http://www.cisco.com/warp/public/707/cisco-sa-20080814-webex.shtml

Pardon me while I get on the phone with my WebEx provider to try to resolve this issue!

Comment  | 
Print  | 
More Insights
Register for Dark Reading Newsletters
White Papers
Flash Poll
Current Issue
Cartoon
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2014-0640
Published: 2014-08-20
EMC RSA Archer GRC Platform 5.x before 5.5 SP1 allows remote authenticated users to bypass intended restrictions on resource access via unspecified vectors.

CVE-2014-0641
Published: 2014-08-20
Cross-site request forgery (CSRF) vulnerability in EMC RSA Archer GRC Platform 5.x before 5.5 SP1 allows remote attackers to hijack the authentication of arbitrary users.

CVE-2014-2505
Published: 2014-08-20
EMC RSA Archer GRC Platform 5.x before 5.5 SP1 allows remote attackers to trigger the download of arbitrary code, and consequently change the product's functionality, via unspecified vectors.

CVE-2014-2511
Published: 2014-08-20
Multiple cross-site scripting (XSS) vulnerabilities in EMC Documentum WebTop before 6.7 SP1 P28 and 6.7 SP2 before P14 allow remote attackers to inject arbitrary web script or HTML via the (1) startat or (2) entryId parameter.

CVE-2014-2515
Published: 2014-08-20
EMC Documentum D2 3.1 before P24, 3.1SP1 before P02, 4.0 before P11, 4.1 before P16, and 4.2 before P05 does not properly restrict tickets provided by D2GetAdminTicketMethod and D2RefreshCacheMethod, which allows remote authenticated users to gain privileges via a request for a superuser ticket.

Best of the Web
Dark Reading Radio
Archived Dark Reading Radio
Dark Reading continuing coverage of the Black Hat 2014 conference brings interviews and commentary to Dark Reading listeners.