CVE-2018-0243
First published: Thu Apr 19 2018(Updated: )
A vulnerability in the detection engine of Cisco Firepower System Software could allow an unauthenticated, remote attacker to bypass a configured file action policy that is intended to drop the Server Message Block Version 2 (SMB2) and SMB Version 3 (SMB3) protocols if malware is detected. The vulnerability is due to incorrect detection of an SMB2 or SMB3 file based on the total file length. An attacker could exploit this vulnerability by sending a crafted SMB2 or SMB3 transfer request through the targeted device. An exploit could allow the attacker to pass SMB2 or SMB3 files that could be malware even though the device is configured to block them. This vulnerability does not exist for SMB Version 1 (SMB1) files. This vulnerability affects Cisco Firepower System Software when one or more file action policies are configured, on software releases prior to 6.2.3. Cisco Bug IDs: CSCvg68807.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Firepower Threat Defense (FTD) | <6.2.3 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2018-0243?
CVE-2018-0243 is classified as a high-severity vulnerability due to its potential for unauthorized access.
How do I fix CVE-2018-0243?
To fix CVE-2018-0243, upgrade Cisco Firepower Threat Defense software to version 6.2.3 or later.
Who is affected by CVE-2018-0243?
CVE-2018-0243 affects users of Cisco Firepower Threat Defense versions prior to 6.2.3.
What can attackers achieve with CVE-2018-0243?
Attackers can potentially bypass file action policies set to drop specific SMB protocols, leading to undetected malware transmission.
Is CVE-2018-0243 remotely exploitable?
Yes, CVE-2018-0243 can be exploited by unauthenticated remote attackers.
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