Multiple vulnerabilities in Cisco WebEx Meetings Server

Published: 2017-10-19

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2017-12296 CVE-2017-12293
CWE-ID	CWE-79 CWE-400
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Cisco WebEx Meetings Server Server applications / Conferencing, Collaboration and VoIP solutions
Vendor	Cisco Systems, Inc

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Cross-site scripting

EUVDB-ID: #VU8883

Risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-12296

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists in Cisco WebEx Meetings Server due to insufficient sanitization of user-supplied data. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

The vulnerability is addressed in the following versions: 2.7.1.3047, 2.8.1.1019, 2.8.1.1023.

Vulnerable software versions

Cisco WebEx Meetings Server: 2.6 - 2.8

CPE2.3

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171018-wms1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Resource exhaustion

EUVDB-ID: #VU8884

Risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-12293

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to cause DoS condition.

The vulnerability exists in Cisco WebEx Meetings Server due to insufficient limitations on the number of connections that can be made. A remote attacker can open multiple connections to the server, trigger server resources exhausting and cause the server to reload.

Successful exploitation of the vulnerability results in denial of service.