CVE-2017-12353 Security feature bypass in Cisco Email Security Appliance

Medium 5.8 Published 30 Nov 2017 Updated 5 Aug 2024

Remote attackers can bypass email filters by sending crafted MIME attachments, allowing malicious content to reach users.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2017-12353?

CVE-2017-12353 is a medium-severity vulnerability in Cisco Asyncos, published on 30 Nov 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the Multipurpose Internet Mail Extensions (MIME) scanner of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) could allow an unauthenticated, remote attacker to bypass configured user filters on the device. The vulnerability is due to improper error handling of a malformed MIME header in an email attachment. An attacker could exploit this vulnerability by sending an email with a crafted MIME attachment. For example, a successful exploit could allow the attacker to bypass configured user filters to drop the email. The malformed MIME headers may not be RFC compliant. However, some mail clients could still allow users to access the attachment, which may not have been properly filtered by the device. Cisco Bug IDs: CSCvf44666.

Weakness: CWE-254

Which versions are affected by CVE-2017-12353?

It affects 1 product.

Products include Cisco Asyncos.

How do I fix CVE-2017-12353?

No fix has been published for CVE-2017-12353 yet. Limit exposure of the affected software until one is available.

Is CVE-2017-12353 being exploited?

There is no known exploitation of CVE-2017-12353 in the wild and no public exploit code.

All Cisco Asyncos vulnerabilities

Sources

Also known as GHSA-jjq2-7h3g-p68f.