The Patching Friars' AlmanacA calendar of CVE saints

January 23

pantsdownHoly card for pantsdown, generated with AI (Claude, Anthropic) for the Lunario dei Frati Patchatori.CC BY-NC-SA 4.0 BMC pantsdown BRACAE DEMISSAE
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Saint Pantsdown, Caught With His Trousers Down

Patron of BMCs, ASPEED chips, and sysadmins who didn't know the server has a second computer inside.

Life

On 23 January 2019 the OpenBMC community revealed that many BMCs built on ASPEED chips, the little management computers hidden inside servers, left hardware bridges open to their own memory. From the main operating system you could read and write inside the BMC, that is inside the guardian itself: a server caught, as the name says, with its trousers down.

Prayer

O Saint Pantsdown, who left the bridges down and the trousers too, let our BMCs close what they do not need. Amen.

How to celebrate

Celebrated by updating the BMC firmware and disabling the bridges nobody knew they had.

Leave the drawbridge down and don't complain about the guests.

Technical record

Disclosed on
January 23 2019
CVE
CVE-2019-6260

The ASPEED ast2400 and ast2500 Baseband Management Controller (BMC) hardware and firmware implement Advanced High-performance Bus (AHB) bridges, which allow arbitrary read and write access to the BMC's physical address space from the host (or from the network in unusual cases where the BMC console uart is attached to a serial concentrator). This CVE applies to the specific cases of iLPC2AHB bridge Pt I, iLPC2AHB bridge Pt II, PCIe VGA P2A bridge, DMA from/to arbitrary BMC memory via X-DMA, UART-based SoC Debug interface, LPC2AHB bridge, PCIe BMC P2A bridge, and Watchdog setup.

Sources: flamingspork.com

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