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Cisco Safe Electronic mail Gateway Filters Bypassed Because of Malware Scanner Concern

By Eduard Kovacs on November 22, 2022

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An nameless researcher has disclosed a number of strategies that can be utilized to bypass a number of the filters in Cisco’s Safe Electronic mail Gateway equipment and ship malware utilizing specifically crafted emails.

In a November 14 submit on the Full Disclosure mailing checklist, the researcher mentioned they’d been involved with the seller, however claimed they didn’t obtain a passable response inside a given timeframe.

“Because the assault complexity is low and exploits have already been printed by a 3rd celebration there should be no additional delay in making the threads publicly identified,” the researcher mentioned.

The bypass strategies depend on “error tolerance and totally different MIME decoding capabilities of e mail purchasers”. In line with the researcher, an attacker might ship a chunk of malware to organizations protected by Cisco Safe Electronic mail Gateway by way of three totally different strategies that work in opposition to Outlook, Thunderbird, Mutt, Vivaldi and different e mail purchasers.

Cisco has printed a bug report in response to those findings, clarifying that some filtering options might be bypassed by a distant, unauthenticated attacker as a consequence of a difficulty with Sophos and McAfee malware scanning engines.

The networking big mentioned the issue impacts its Safe Electronic mail Gateway product, previously often known as Cisco Electronic mail Safety Equipment (ESA), when working with a default configuration.

“The difficulty is because of improper identification of probably malicious emails or attachments. An attacker might exploit this situation by sending a malicious e mail with malformed Content material-Kind headers (MIME Kind) by way of an affected gadget. An exploit might permit the attacker to bypass default anti-malware filtering options based mostly on the affected scanning engines and efficiently ship malicious messages to the tip purchasers,” Cisco defined.

The corporate instructed SecurityWeek that this isn’t a vulnerability within the Safe Electronic mail Gateway product itself.

“We have now really helpful a workaround to mitigate the problem in most situations,” a Cisco spokesperson mentioned. “Cisco’s anti-malware suppliers have additionally dedicated to supply a repair that might be pushed on to prospects. No actions are wanted on the a part of the shopper. Our high precedence is the satisfaction and assist of our prospects and companions, and we’re dedicated to speaking brazenly and transparently with our stakeholders.”

SecurityWeek has additionally reached out to Sophos and McAfee for remark. Whereas McAfee has not responded, Sophos mentioned it’s conscious of the problem and it has already been engaged on hardening the combination of its scanning engine with Cisco’s product. The cybersecurity agency famous that, within the meantime, Cisco has supplied a workaround for customers.

The researcher who disclosed the bypass strategies pointed to an open supply toolkit designed for producing emails that take a look at safety merchandise in opposition to such assaults. The researcher steered that the workaround proposed by Cisco does deal with the strategies exploited by the open supply instrument, but it surely doesn’t stop all of them.

Safety bypass strategies involving Multipurpose Web Mail Extensions (MIME) headers have been identified for a few years and have been discovered within the merchandise of a number of distributors.

Associated: Microsoft Patches MotW Zero-Day Exploited for Malware Supply

Associated: Outlook Safety Function Bypass Allowed Sending Malicious Hyperlinks

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