Cisco Deals with Remote Attack Holes

Wednesday, May 15, 2019 @ 12:05 PM gHale

Cisco is working on one fix and mitigated another vulnerability in two products that could allow a remote attacker to take control of an affected system.

Cisco’s IOS XE Software Web UI is suffering from a command injection vulnerability, while the Secure Boot Hardware has a tampering issue.

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In one issue, a vulnerability in the web-based user interface (Web UI) of Cisco IOS XE Software could allow an authenticated, remote attacker to execute commands on the underlying Linux shell of an affected device with root privileges.

The vulnerability occurs because the affected software improperly sanitizes user-supplied input. An attacker who has valid administrator access to an affected device could exploit this vulnerability by supplying a crafted input parameter on a form in the Web UI and then submitting that form. A successful exploit could allow the attacker to run arbitrary commands on the device with root privileges, which may lead to complete system compromise.

While there are no workarounds, Cisco released software updates that address this vulnerability, the company said in its advisory.

This vulnerability affects Cisco devices running an affected release of Cisco IOS XE Software with the HTTP Server feature enabled. The default state of the HTTP Server feature is version dependent.

Cisco has an updates to mitigate the vulnerability.

In the other vulnerability, there is an issue in the logic that handles access control to one of the hardware components in Cisco’s proprietary Secure Boot implementation could allow an authenticated, local attacker to write a modified firmware image to the component. This vulnerability affects multiple Cisco products that support hardware-based Secure Boot functionality.

The vulnerability is due to an improper check on the area of code that manages on-premise updates to a Field Programmable Gate Array (FPGA) part of the Secure Boot hardware implementation, Cisco said.

An attacker with elevated privileges and access to the underlying operating system that is running on the affected device could exploit this vulnerability by writing a modified firmware image to the FPGA, Cisco said. A successful exploit could either cause the device to become unusable (and require a hardware replacement) or allow tampering with the Secure Boot verification process, which under some circumstances may allow the attacker to install and boot a malicious software image.

Cisco will release software updates that address this vulnerability. There are currently no workarounds, the company said in its advisory.



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