Cisco’s ACL Comedy of Errors: When Compressing Level 3 Leads to Level 10 Headaches!
If your router’s got a hybrid IPv4 ACL with compress level 3, it’s time for a little detective work. Cisco IOS XR Software users, check your ACL’s source and destination network object group count. If you hit 32 or more, congratulations, you’re vulnerable! But hey, at least you’re not boring.
Hot Take:
Packing a punch like a caffeinated squirrel on a tightrope, Cisco’s latest vulnerability has left network admins sweating bullets and doing the network equivalent of a rain dance to ward off potential cyber shenanigans. Who knew compressing ACLs could lead to more drama than a reality TV reunion episode?
Key Points:
- Cisco IOS XR Software is vulnerable if running a specific configuration with hybrid IPv4 ACLs.
- The vulnerability affects several Cisco products, including the NCS 540, 560, 5500, and 5700 Series Routers.
- To be vulnerable, devices must have hybrid ACLs with compress level 3 and more than 32 source or destination network object groups.
- A configuration check can reveal if your device is at risk, using specific CLI commands.
- Admins need to review and possibly update their ACL configurations to avoid potential exploitation.
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