PT-2015-1415 · Cisco · Cisco Ios Xr

Published 2015-06-22 · Updated 2016-12-29 · CVE-2015-4205

Positive Technologies (AI Summary)

CVSS v2.0

5.7

Medium

Base vector

AV:A/AC:M/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Cisco IOS XR version 5.3.1

Description The issue is related to errors in resource management, allowing a remote attacker to cause a denial of service by sending crafted IEEE 802.3x flow-control PAUSE frames. This can lead to a Network Processing Unit (NPU) chip reset and potentially a reload of the affected line card. The vulnerability is due to improper processing of crafted IEEE 802.3x flow control pause frames. An attacker must have access to the same broadcast or collision domain as the targeted device to exploit this vulnerability.

Recommendations For Cisco IOS XR version 5.3.1, update to a newer version that includes the fix for this issue, as confirmed by Cisco. As a temporary workaround, consider restricting access to the local network to minimize the risk of exploitation. Avoid using crafted IEEE 802.3x flow control pause frames on the affected device until the issue is resolved.

Fix

DoS

Weakness Enumeration

CWE-399

Related Identifiers

BDU:2015-10510

CVE-2015-4205

Affected Products

Cisco Ios Xr

References · 6

• http://tools.cisco.com/security/center/viewAlert.x?alertId=39455 · Vendor Advisory
• https://bdu.fstec.ru/vul/2015-10510 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2015-4205 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/Cisco-SA-20150622-CVE-2015-4205 · Note
• http://securitytracker.com/id/1032691 · Note
• http://securityfocus.com/bid/75352 · Note