IBM Flex System switch firmware products update for OpenSSL

1) Improper input validation

EUVDB-ID: #VU13325

Risk: Low

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:Clear]

CVE-ID: CVE-2018-0732

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to improper handling of large prime values by the affected software during key agreement operations in a Transport Layer Security (TLS) handshake using an Ephemeral Diffie-Hellman (DHE) based cipher suite. A remote attacker can send a large prime value from a malicious OpenSSL server to a targeted OpenSSL client and cause the client to stop responding while generating a key for the prime value.

Mitigation

Install update from vendor's website.

Vulnerable software versions

G8264CS_SI_Fabric_Image: before 7.8.22.00

Flex System Fabric CN4093 10Gb ScSE firmware: before 7.8.22.00

IBM Flex System Fabric SI4093 GbFSIM 10Gb Scalable Switch: before 7.8.22.00

IBM Flex System EN2092 1Gb Ethernet Scalable Switch: before 7.8.22.00

Flex System Fabric EN4093/EN4093R 10Gb Scalable Switch: before 7.8.22.00

CPE2.3

• cpe:2.3:h:ibm_corporation:g8264cs_si_fabric_image:*:*:*:*:*:*:*:*
• cpe:2.3:h:ibm_corporation:flex_system_fabric_cn4093_10gb_scse_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:h:ibm_corporation:ibm_flex_system_fabric_si4093_gbfsim_10gb_scalable_switch:*:*:*:*:*:*:*:*
• 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:*:*:*:*:*:*:*:*

External links

https://www.ibm.com/support/pages/node/875374

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 device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.