Multiple vulnerabilities in IBM Flex System switch firmware
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2019-11478 CVE-2019-11477 CVE-2019-11479 |
| CWE-ID | CWE-400 CWE-190 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Flex System Fabric CN4093 10Gb ScSE firmware Hardware solutions / Firmware Flex System Fabric SI4093 System Interconnect Module firmware Hardware solutions / Firmware IBM Flex System EN2092 1Gb Ethernet Scalable Switch Hardware solutions / Routers & switches, VoIP, GSM, etc Flex System Fabric EN4093/EN4093R 10Gb Scalable Switch Other software / Other software solutions |
| Vendor | IBM Corporation |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Resource exhaustion
EUVDB-ID: #VU18946
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-2019-11478
CWE-ID:
CWE-400 - Resource exhaustion
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform denial of service (DoS) attack.
The vulnerability exists due to an error when processing TCP Selective Acknowledgment (SACK) sequences within the Linux kernel TCP retransmission queue implementation in tcp_fragment. A remote non-authenticated attacker can send specially crafted network traffic to the affected system and perform a denial of service (DoS) attack.
Mitigation
Install update from vendor's website.
Vulnerable software versionsFlex System Fabric CN4093 10Gb ScSE firmware: before 7.8.24.0
Flex System Fabric SI4093 System Interconnect Module firmware: before 7.8.24.0
IBM Flex System EN2092 1Gb Ethernet Scalable Switch: before 7.8.24.0
Flex System Fabric EN4093/EN4093R 10Gb Scalable Switch: before 7.8.24.0
CPE2.3- cpe:2.3:h:ibm_corporation:flex_system_fabric_cn4093_10gb_scse_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:h:ibm_corporation:flex_system_fabric_si4093_system_interconnect_module_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:h:ibm_corporation:ibm_flex_system_en2092_1gb_ethernet_scalable_switch:*:*:*:*:*:*:*:*
- cpe:2.3:a:ibm_corporation:flex_system_fabric_en4093_en4093r_10gb_scalable_switch:*:*:*:*:*:*:*:*
https://www.ibm.com/support/pages/node/1103547
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) Integer overflow
EUVDB-ID: #VU18813
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-2019-11477
CWE-ID:
CWE-190 - Integer overflow
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform denial of service (DoS) attack.
The vulnerability exists due to integer overflow when handling TCP Selective Acknowledgments (SACKs) due to incorrect processing of TCP_SKB_CB(skb)->tcp_gso_segs value in Linux kernel. A remote non-authenticated attacker can send specially crafted network traffic to the affected system, trigger integer overflow and render the system unavailable.
Successful exploitation of the vulnerability allows a remote attacker to perform denial of service (DoS) attack.
MitigationInstall update from vendor's website.
Vulnerable software versionsFlex System Fabric CN4093 10Gb ScSE firmware: before 7.8.24.0
Flex System Fabric SI4093 System Interconnect Module firmware: before 7.8.24.0
IBM Flex System EN2092 1Gb Ethernet Scalable Switch: before 7.8.24.0
Flex System Fabric EN4093/EN4093R 10Gb Scalable Switch: before 7.8.24.0
CPE2.3- cpe:2.3:h:ibm_corporation:flex_system_fabric_cn4093_10gb_scse_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:h:ibm_corporation:flex_system_fabric_si4093_system_interconnect_module_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:h:ibm_corporation:ibm_flex_system_en2092_1gb_ethernet_scalable_switch:*:*:*:*:*:*:*:*
- cpe:2.3:a:ibm_corporation:flex_system_fabric_en4093_en4093r_10gb_scalable_switch:*:*:*:*:*:*:*:*
https://www.ibm.com/support/pages/node/1103547
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.
3) Resource exhaustion
EUVDB-ID: #VU18947
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-2019-11479
CWE-ID:
CWE-400 - Resource exhaustion
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform denial of service (DoS) attack.
The vulnerability exists due to presence of hard-coded MSS value (48 bytes) in the Linux kernel source code. A remote attacker can fragment TCP resend queues significantly more than if a larger MSS were enforced and perform denial of service (DoS) attack.
MitigationInstall update from vendor's website.
Vulnerable software versionsFlex System Fabric CN4093 10Gb ScSE firmware: before 7.8.24.0
Flex System Fabric SI4093 System Interconnect Module firmware: before 7.8.24.0
IBM Flex System EN2092 1Gb Ethernet Scalable Switch: before 7.8.24.0
Flex System Fabric EN4093/EN4093R 10Gb Scalable Switch: before 7.8.24.0
CPE2.3- cpe:2.3:h:ibm_corporation:flex_system_fabric_cn4093_10gb_scse_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:h:ibm_corporation:flex_system_fabric_si4093_system_interconnect_module_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:h:ibm_corporation:ibm_flex_system_en2092_1gb_ethernet_scalable_switch:*:*:*:*:*:*:*:*
- cpe:2.3:a:ibm_corporation:flex_system_fabric_en4093_en4093r_10gb_scalable_switch:*:*:*:*:*:*:*:*
https://www.ibm.com/support/pages/node/1103547
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.
