Information disclosure in IBM AIX and VIOS

1) Information disclosure

EUVDB-ID: #VU11854

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-0737

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

The vulnerability allows a local attacker to obtain potentially sensitive information on the target system.

The weakness exists in the RSA key generation algorithm's BN_mod_inverse() and BN_mod_exp_mont() functions due to a cache timing side channel attack. A local attacker can recover the private key.

Mitigation

Install update from vendor's website.

Vulnerable software versions

IBM VIOS: 2.2.0 - 2.2.6

IBM AIX: 5.3 - 7.2

CPE2.3

• cpe:2.3:a:ibm_corporation:ibm_vios:2.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:ibm_corporation:ibm_vios:2.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:ibm_corporation:ibm_vios:2.2.2:*:*:*:*:*:*:*
• cpe:2.3:o:ibm_corporation:ibm_aix:5.3:*:*:*:*:*:*:*
• cpe:2.3:o:ibm_corporation:ibm_aix:6.1.0:*:*:*:*:*:*:*
• cpe:2.3:o:ibm_corporation:ibm_aix:7.1:*:*:*:*:*:*:*

External links

https://aix.software.ibm.com/aix/efixes/security/openssl_advisory27.asc

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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