Denial of service in Cisco ESA, Cisco WSA, and Cisco SMA
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2020-3164 CVE-2020-3178 |
| CWE-ID | CWE-20 CWE-601 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Cisco AsyncOS for Cisco Email Security Appliance Server applications / IDS/IPS systems, Firewalls and proxy servers Cisco Web Security Appliance Server applications / IDS/IPS systems, Firewalls and proxy servers Cisco Content Security Management Appliance Server applications / IDS/IPS systems, Firewalls and proxy servers |
| Vendor | Cisco Systems, Inc |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
Updated 11.05.2020
Added vulnerability #2
1) Input validation error
EUVDB-ID: #VU25788
Risk: Medium
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2020-3164
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper validation of specific HTTP request headers. A remote attacker can send a specially crafted HTTP request to an affected device, trigger a prolonged status of high CPU utilization relative to the GUI process(es) and perform a denial of service (DoS) attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionsCisco AsyncOS for Cisco Email Security Appliance: 13.0.0 392
Cisco Web Security Appliance: 12.0.1 268
Cisco Content Security Management Appliance: before 13.6.0
CPE2.3- cpe:2.3:a:cisco_systems:cisco_asyncos_for_cisco_email_security_appliance:*:*:*:*:*:*:*:*
- cpe:2.3:a:cisco_systems:cisco_asyncos_for_cisco_email_security_appliance:13.0.0 392:*:*:*:*:*:*:*
- cpe:2.3:a:cisco_systems:cisco_web_security_appliance:*:*:*:*:*:*:*:*
- cpe:2.3:a:cisco_systems:cisco_web_security_appliance:12.0.1 268:*:*:*:*:*:*:*
- cpe:2.3:a:cisco_systems:cisco_content_security_management_appliance:*:*:*:*:*:*:*:*
Q & 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.
2) Open redirect
EUVDB-ID: #VU27685
Risk: Medium
CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2020-3178
CWE-ID:
CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to redirect victims to arbitrary URL.
The vulnerability exists due to improper input validation of the parameters of an HTTP request in the web-based GUI of Cisco AsyncOS Software for Cisco Content Security Management Appliance (SMA). A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.
Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.
MitigationInstall updates from vendor's website.
Vulnerable software versionsCisco Content Security Management Appliance: before 13.6.0
CPE2.3 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.
