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HomeCyber Security4 Flaws, Different Weaknesses Undermine Cisco ASA Firewalls

4 Flaws, Different Weaknesses Undermine Cisco ASA Firewalls



Cisco’s enterprise-class firewalls have a minimum of a dozen vulnerabilities — 4 of which have been assigned CVE identifiers — that might permit attackers to infiltrate networks protected by the gadgets, a safety researcher from vulnerability administration agency Rapid7 plans to say in a presentation on the Black Hat USA convention on Aug. 11.

The vulnerabilities have an effect on Cisco’s Adaptive Safety Equipment (ASA) software program, the working system for the corporate’s enterprise-class firewalls, and its ecosystem. Essentially the most important safety weak spot (CVE-2022-20829) is that the Adaptive Safety System Supervisor (ASDM) binary packages aren’t digitally signed, which — together with the failure to confirm a server’s SSL certificates — permits an attacker to deploy personalized ASA binaries that may then set up recordsdata onto directors’ computer systems.

As a result of directors simply count on the ASDM software program to return preinstalled on gadgets, the truth that the binaries aren’t signed provides attackers a big provide chain assault, says Jake Baines, lead safety researcher at Rapid7.

“If somebody buys an ASA machine on which the attacker has put in their very own code, the attackers do not get shell on the ASA machine, however when an administrator connects to the machine, now [the attackers] have a shell on [the administrator’s] pc,” he says. “To me, that’s the most harmful assault.”

The dozen safety weaknesses embrace points that impression gadgets and digital situations operating the ASA software program, in addition to vulnerabilities within the Firepower next-generation firewall module. Greater than 1 million ASA gadgets are deployed worldwide by Cisco’s clients, though a Shodan search exhibits that solely about 20% have the administration interface uncovered to the web, Baines says.

As a provide chain assault, the vulnerabilities would give risk actors the power to compromise a digital machine on the fringe of the community — an surroundings that the majority safety groups wouldn’t analyze for safety threats, he says.

Full Entry

“You probably have entry to the digital machine, you might have full entry contained in the community, however extra importantly, you’ll be able to sniff all of the visitors going by way of, together with decrypted VPN visitors,” Baines says. “So, it’s a actually excellent place for an attacker to sit back out and pivot, however most likely simply sniff for credentials or monitor the visitors flowing into the community.”

Baines found the problem when he was investigating the Cisco Adaptive Safety System Supervisor (ASDM) to get “a degree set on how the GUI (graphical person interface) works” and pull aside the protocol, he says.

A part put in on administrator’s methods, generally known as the ASDM launcher, may very well be utilized by attackers to ship malicious code in Java class recordsdata or by way of the ASDM Net portal. In consequence, attackers might create a malicious ASDM bundle to compromise the administrator’s system by way of installers, malicious internet pages, and malicious Java elements.

The ADSM vulnerabilities found by Rapid7 embrace a recognized vulnerability (CVE-2021-1585) that permits an unauthenticated distant code execution (RCE) assault that Cisco claimed was patched in a current replace, however Baines found it remained.

Along with the ADSM points, Rapid7 discovered a handful of safety weaknesses within the Firepower next-generation firewall module, together with an authenticated distant command injection vulnerability (CVE-2022-20828). The Firepower module is a Linux-based digital machine hosted on the ASA machine and runs the Snort scanning software program to categorise visitors, based on Rapid7’s advisory.

“The ultimate takeaway for this challenge must be that exposing ASDM to the web may very well be very harmful for ASA that use the Firepower module,” the advisory states. “Whereas this may be a credentialed assault, as famous beforehand, ASDM’s default authentication scheme discloses username and passwords to energetic MitM [machine-in-the-middle] attackers.”

Updating might be advanced for Cisco ASA home equipment, presenting an issue for firms in mitigating the vulnerabilities. Essentially the most extensively deployed model of the ASA software program is 5 years previous, Baines says. Solely about half a p.c of installations up to date their ASA software program inside seven days to the most recent model, he provides.

“There isn’t any auto-patch characteristic, so the preferred model of the equipment working system is sort of previous,” Baines says.

Cisco has needed to cope with safety points in its different merchandise as properly. Final week, Cisco disclosed a trio of vulnerabilities in its RV collection of small enterprise routers. The vulnerabilities may very well be used collectively to permit an attacker to execute arbitrary code on Cisco Small Enterprise RV160, RV260, RV340, and RV345 Collection Routers with out authenticating first.

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