New Cisco IOS Zero-Day Delivers a Double Punch

A vulnerability affecting Cisco working techniques might allow attackers to take full management of affected units, execute arbitrary code, and trigger reloads that set off denial of service (DoS) circumstances. And not less than one try at exploitation has already occurred within the wild.

On Sept. 27, Cisco launched its latest semi-annual Security Advisory Bundled Publication. The publication detailed eight vulnerabilities affecting its IOS and IOS XE working techniques, amongst them CVE-2023-20109an out-of-bounds write situation which earned a 6.6 “Medium” severity rating. In accordance with Cisco’s security advisoryCVE-2023-20109 has already been the thing of not less than one tried exploitation within the wild.

In a press release to Darkish Studying, a Cisco spokesperson acknowledged the vulnerabilities. “Cisco has released software updates to address these vulnerabilities. Please refer to the specific security advisory for additional detail,” the spokesperson wrote.

To Tim Silverline, vice chairman of safety at Gluware, this vulnerability should not be ignored, but it surely’s additionally no motive to panic.

“Organizations should implement the mitigation strategies proposed by Cisco, but the danger here is not substantial. If the bad actor has full access to the target environment, then you are already compromised and this is just one way in which they could exploit those permissions to move laterally and escalate privileges,” he says.

The Flaw in Cisco’s VPN

CVE-2023-20109 impacts Cisco’s VPN function, Group Encrypted Transport VPN (GET VPN). GET VPN works inside unicast or multicast environments by establishing a rotating set of encryption keys, shared inside a gaggle, the place any group member can encrypt or decrypt knowledge with out want for a direct point-to-point connection.

Ought to an attacker have already infiltrated a non-public community setting of this kind, they may exploit it in one among two methods. They will both compromise the important thing server and alter packets despatched to group members, or they’ll construct and set up their very own key server and reconfigure group members to speak with it as an alternative of the true key server.

A Dangerous Day for Cisco

On the exact same day of the semi-annual safety publication, US and Japanese authorities issued a joint warning about a Chinese state APT rewriting Cisco firmware in assaults in opposition to giant, multinational organizations.

“This is not indicative of any new trend,” Silverline states, for these of us extra inclined to coincidences or conspiracies. Like every main vendor, Cisco will at all times have new vulnerabilities, “it just so happens that we’ve had two events in as many days.”

However it is a continuation of cybertrends seen during the last a number of years, Silverline provides. “Attacks are becoming more advanced, they are being capitalized on quickly,” he says. Edge applied sciences, specifically, are an attacker’s ideal starting pointexposing company networks to the broader Internet, whereas sometimes lacking the robust security protections of their server counterparts.

Silverline suggests numerous methods organizations can handle widespread points. “As a best practice, network devices should never be sending outbound communications. Once this is discovered, network automation capabilities can ensure that configurations are verified and implemented across the network to prevent bad actors from executing the attack,” he says. “Similarly, audit capabilities can alert network teams when any change or violation of policies takes place across your network devices so that they can quickly revert the device to the previous config.”

Author: Nate Nelson, Contributing Author, Darkish Studying
Date: 2023-09-28 17:45:00

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Alina A, Toronto
Alina A, Toronto
Alina A, an UofT graduate & Google Certified Cyber Security analyst, currently based in Toronto, Canada. She is passionate for Research and to write about Cyber-security related issues, trends and concerns in an emerging digital world.


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