Denial of service in Cisco IOS XR

1) Denial of service

EUVDB-ID: #VU6400

Risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-3876

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability alows a remote attacker to cause DoS condition on the target device.

The weakness exists due to improper handling of gRPC requests in the Event Management Service daemon (emsd) of Cisco IOS XR routers. A remote attacker can send unauthenticated gRPC requests to the affected device and crash the device in such a manner that manual intervention is required to recover.

Successful exploitation of the vulnerability may result in denial of service.

Mitigation

Update to version 6.1.2 or later.

Vulnerable software versions

Cisco IOS XR: 6.0.1 - 6.1.1

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170503-ios-xr

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.