CVE-2018-15453: Cisco Email Security Appliance Memory Corruption Denial of Service Vulnerability
First published: Thu Jan 10 2019(Updated: )
A vulnerability in the Secure/Multipurpose Internet Mail Extensions (S/MIME) Decryption and Verification or S/MIME Public Key Harvesting features of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause an affected device to corrupt system memory. A successful exploit could cause the filtering process to unexpectedly reload, resulting in a denial of service (DoS) condition on the device. The vulnerability is due to improper input validation of S/MIME-signed emails. An attacker could exploit this vulnerability by sending a malicious S/MIME-signed email through a targeted device. If Decryption and Verification or Public Key Harvesting is configured, the filtering process could crash due to memory corruption and restart, resulting in a DoS condition. The software could then resume processing the same S/MIME-signed email, causing the filtering process to crash and restart again. A successful exploit could allow the attacker to cause a permanent DoS condition. This vulnerability may require manual intervention to recover the ESA.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Email Security Appliance Firmware | =11.0.1-401 | |
| Cisco Email Security Appliance Firmware | =11.1.0-131 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is CVE-2018-15453?
CVE-2018-15453 is a vulnerability in the Secure/Multipurpose Internet Mail Extensions (S/MIME) Decryption and Verification or S/MIME Public Key Harvesting features of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA).
How does CVE-2018-15453 affect Cisco Email Security Appliance?
CVE-2018-15453 allows an unauthenticated, remote attacker to cause an affected device to corrupt.
What is the severity of CVE-2018-15453?
The severity of CVE-2018-15453 is high with a CVSS score of 8.6.
How can I fix CVE-2018-15453?
To fix CVE-2018-15453, Cisco recommends upgrading to a fixed software release.
Where can I find more information about CVE-2018-15453?
You can find more information about CVE-2018-15453 in the references provided: [1] [2].
- collector/nvd-index
- agent/references
- agent/softwarecombine
- agent/type
- collector/mitre-cve
- source/MITRE
- agent/author
- agent/weakness
- agent/last-modified-date
- agent/title
- agent/severity
- agent/tags
- agent/description
- agent/first-publish-date
- agent/event
- vendor/cisco
- canonical/cisco email security appliance firmware
- version/cisco email security appliance firmware/11.0.1-401
- version/cisco email security appliance firmware/11.1.0-131