Security restrictions bypass in Cisco Email Security Appliance
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2018-0447 |
| CWE-ID | CWE-20 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Cisco Email Security Appliance Server applications / IDS/IPS systems, Firewalls and proxy servers |
| Vendor | Cisco Systems, Inc |
Security Bulletin
This security bulletin contains one low risk vulnerability.
1) Improper input validation
EUVDB-ID: #VU14696
Risk: Low
CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-0447
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote unauthenticated attacker to bypass security restrictions on the target system.
The vulnerability exists in the anti-spam protection mechanisms of Cisco AsyncOS Software for the Cisco Email Security Appliance (ESA) due to incomplete input and validation checking mechanisms for certain Sender Policy Framework (SPF) messages that are sent to an affected device. A remote attacker can send a customized SPF packet, bypass the URL filters that are configured and pass through the device.
MitigationInstall update from vendor's website.
Vulnerable software versionsCisco Email Security Appliance: 11.1.0 131
External linksQ & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
