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Vulnerabilities/Threats

3 MIN READ

News



NEW CISCO IOS ZERO-DAY DELIVERS A DOUBLE PUNCH

The networking giant discloses new vulnerabilities the same day as warnings get
issued that Cisco gear has been targeted in a Chinese APT attack.
Nate Nelson
Contributing Writer, Dark Reading
September 28, 2023
Source: Zoonar GmbH via Alamy Stock Photo
PDF


A vulnerability affecting Cisco operating systems could enable attackers to take
full control of affected devices, execute arbitrary code, and cause reloads that
trigger denial of service (DoS) conditions. And at least one attempt at
exploitation has already occurred in the wild.



On Sept. 27, Cisco released its latest semi-annual Security Advisory Bundled
Publication. The publication detailed eight vulnerabilities affecting its IOS
and IOS XE operating systems, among them CVE-2023-20109, an out-of-bounds write
issue which earned a 6.6 "Medium" severity score. According to Cisco's security
advisory, CVE-2023-20109 has already been the object of at least one attempted
exploitation in the wild.

In a statement to Dark Reading, 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 president of security at Gluware, this vulnerability
shouldn't be ignored, but it's also no reason 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 affects Cisco's VPN feature, Group Encrypted Transport VPN (GET
VPN). GET VPN works within unicast or multicast environments by establishing a
rotating set of encryption keys, shared within a group, where any group member
can encrypt or decrypt data without need for a direct point-to-point connection.

Should an attacker have already infiltrated a private network environment of
this sort, they could exploit it in one of two ways. They can either compromise
the key server and alter packets sent to group members, or they can build and
install their own key server and reconfigure group members to communicate with
it instead of the true key server.


A BAD DAY FOR CISCO

On the very same day of the semi-annual security publication, US and Japanese
authorities issued a joint warning about a Chinese state APT rewriting Cisco
firmware in attacks against large, multinational organizations.



"This is not indicative of any new trend," Silverline states, for those of us
more inclined to coincidences or conspiracies. Like any major vendor, Cisco will
always have new vulnerabilities, "it just so happens that we've had two events
in as many days."

But this is a continuation of cybertrends seen over the last several years,
Silverline adds. "Attacks are becoming more advanced, they are being capitalized
on quickly," he says. Edge technologies, in particular, are an attacker's ideal
starting point, exposing corporate networks to the broader Web, while sometimes
lacking the robust security protections of their server counterparts.

Silverline suggests a number of ways organizations can address common issues.
"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."

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