top of page

IOS-XR | CVE-2020-26070

A high-severity flaw in Cisco’s IOS XR software could allow unauthenticated, remote attackers to cripple Cisco Aggregation Services Routers (ASR).

The flaw stems from Cisco IOS XR, a train of Cisco Systems’ widely deployed Internetworking Operating System (IOS). The OS powers the Cisco ASR 9000 series, which are fully distributed routers engineered to address massive surges in video traffic.

The flaw (CVE-2020-26070), which ranks 8.6 out of 10 on the CVSS scale, stems from an issue with the ingress packet processing function of Cisco IOS XR software. Ingress packet processing is a technique used to sort through incoming packets from different networks.

The vulnerability is due to improper resource allocation when an affected device processes network traffic. An attacker could exploit the flaw by sending specific streams of Layer 2 or Layer 3 protocol data units (PDUs) to an affected device, ultimately exhausting its buffer resources and crashing the device.

When a device is experiencing buffer resources exhaustion, the following message may be seen in the system logs: “%PKT_INFRA-spp-4-PKT_ALLOC_FAIL : Failed to allocate n packets for sending”.

The device would need to be restarted to regain functionality, said Cisco. This vulnerability affects Cisco ASR 9000 series routers if they are running a Cisco IOS XR Software release earlier than releases 6.7.2 or 7.1.2. Cisco fixed this vulnerability in Cisco IOS XR Software releases 6.7.2 and later and releases 7.1.2 and later.


Checksum value = fc8d55c5a4225e47a8f5cae833257a69

49 views0 comments

Recent Posts

See All

Securing IOS-XE Routing Protocols

Securing the routing information prevents an attacker from introducing false routing information into the network, which could be used as part of a Denial of Service (DoS) or Man-in-the-Middle (MiTM)

Cisco Duo Log Sync (DLS)

Duologsync (DLS) is a utility written by Duo Security that supports fetching logs from Duo endpoints and ingesting them to different SIEMs. Logging: A logging filepath can be specified in config.yml.

Umbrella VA logging to Remote Syslog Server

Syslog is a protocol that computer systems use to send event data logs to a central location for storage. Logs can then be accessed by analysis and reporting software to perform audits, monitoring, tr

Comentarios


bottom of page