Denial of service in Cisco products
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2018-5390 CVE-2018-6922 |
| CWE-ID | CWE-400 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Meeting Management Other software / Other software solutions Cisco Web Security Appliance Server applications / IDS/IPS systems, Firewalls and proxy servers Cisco TelePresence Video Communication Server Server applications / Other server solutions |
| Vendor | Cisco Systems, Inc |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Resource exhaustion
EUVDB-ID: #VU14200
Risk: Medium
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2018-5390
CWE-ID:
CWE-400 - Resource exhaustion
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to cause DoS condition on the target system.
The vulnerability exists due to the system uses an inefficient TCP reassembly algorithm. A remote attacker can send specially crafted packets within ongoing TCP sessions to consume excessive CPU resources and cause the service to crash.
Note: The issue has been called "SegmentSmack".
MitigationInstall update from vendor's website.
Vulnerable software versionsMeeting Management: 1.0 - 1.0.1
Cisco Web Security Appliance: 11.7.0 FCS 001
Cisco TelePresence Video Communication Server: X8.11
CPE2.3- cpe:2.3:a:cisco_systems:meeting_management:1.0:*:*:*:*:*:*:*
- cpe:2.3:a:cisco_systems:meeting_management:1.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:cisco_systems:cisco_web_security_appliance:11.7.0 FCS 001:*:*:*:*:*:*:*
- cpe:2.3:a:cisco_systems:cisco_telepresence_video_communication_server:X8.11:*:*:*:*:*:*:*
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180824-linux-tcp
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Resource exhaustion
EUVDB-ID: #VU14203
Risk: Medium
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2018-6922
CWE-ID:
CWE-400 - Resource exhaustion
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to cause DoS condition on the target system.
The vulnerability exists due to the system uses an inefficient TCP reassembly algorithm. A remote attacker can send specially crafted packets within ongoing TCP sessions to consume excessive CPU resources and cause the service to crash.
MitigationInstall update from vendor's website.
Vulnerable software versionsMeeting Management: 1.0 - 1.0.1
Cisco Web Security Appliance: 11.7.0 FCS 001
Cisco TelePresence Video Communication Server: X8.11
CPE2.3- cpe:2.3:a:cisco_systems:meeting_management:1.0:*:*:*:*:*:*:*
- cpe:2.3:a:cisco_systems:meeting_management:1.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:cisco_systems:cisco_web_security_appliance:11.7.0 FCS 001:*:*:*:*:*:*:*
- cpe:2.3:a:cisco_systems:cisco_telepresence_video_communication_server:X8.11:*:*:*:*:*:*:*
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180824-linux-tcp
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
