IBM Flex System switch firmware products update for OpenSSL

1) Use of a broken or risky cryptographic algorithm

EUVDB-ID: #VU17860

Risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-1559

CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

Exploit availability: No

Description

The vulnerability allows a remote attacker to decrypt sensitive information.

The vulnerability exists due to the way an application behaves, when it receives a 0-byte record with invalid padding compared to the record with an invalid MAC, which results in padding oracle. A remote attacker can decrypt data.

Successful exploitation of the vulnerability requires that the application is using "non-stitched" ciphersuites and calls SSL_shutdown() twice (first, via a BAD_RECORD_MAC and again via a CLOSE_NOTIFY). 

Mitigation

Install update from vendor's website.

Vulnerable software versions

Flex System Fabric EN4093/EN4093R 10Gb Scalable Switch: before 7.8.25.0

IBM Flex System CN4093 10Gb Converged Scalable Switch: before 7.8.25.0

IBM Flex System Fabric SI4093 GbFSIM 10Gb Scalable Switch: before 7.8.25.0

IBM Flex System EN2092 1Gb Ethernet Scalable Switch: before 7.8.25.0

CPE2.3

• cpe:2.3:a:ibm_corporation:flex_system_fabric_en4093_en4093r_10gb_scalable_switch:*:*:*:*:*:*:*:*
• cpe:2.3:h:ibm_corporation:ibm_flex_system_cn4093_10gb_converged_scalable_switch:*:*:*:*:*:*:*:*
• 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:*:*:*:*:*:*:*:*

External links

https://www.ibm.com/support/pages/node/5371371

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.