#VU12994 Memory corruption in Cisco Expressway and Cisco TelePresence Video Communication Server - CVE-2017-3790

Vulnerability identifier: #VU12994

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-3790

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Expressway
Server applications / Conferencing, Collaboration and VoIP solutions
Cisco TelePresence Video Communication Server
Server applications / Other server solutions

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to boundary error when processing h323 calls. A remote unauthenticated attacker can initiate connection to the vulnerable service, send specially crafted h224 data in Real-Time Transport Protocol (RTP) packets, trigger memory corruption and h323 call parser and crash the service.

Successful exploitation of the vulnerability requires that the attacker can send network packets to h323 interface.

Mitigation
Update to version X8.8.2.

Vulnerable software versions

Cisco Expressway: X8.1 - X8.8.1

Cisco TelePresence Video Communication Server: All versions

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External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170125-expressway
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCus99263

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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.