Security Bulletin: A vulnerability exists in the restricted shell of the IBM FlashSystem 900

Summary

A vulnerability exists in the IBM FlashSystem 900 restricted shell (CVE-2021-29873). An exploit of this vulnerability could allow an authenticated attacker to access sensitive information or cause a denial of service.

Vulnerability Details

CVEID:CVE-2021-29873
**DESCRIPTION:**IBM Flash System 900 could allow an authenticated attacker to obtain sensitive information and cause a denial of service due to a restricted shell escape vulnerability.
CVSS Base score: 8.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/206229 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

Storage Node machine type and models (MTMs) affected:

• 9840-AE1 and 9843-AE1
• 9840-AE2 and 9843-AE2
• 9840-AE3 and 9843-AE3

Supported storage node code versions which are affected:

• VRMFs prior to 1.5.2.10
• VRMFs prior to 1.6.1.4

**Note:**For information on IBM FlashSystem V9000 SVC code levels affected and remediated, search for the equivalent security bulletin here: IBM Support

Remediation/Fixes

9840-AE1 and 9843-AE1

FlashSystem 900 MTMs:

9843-UF3, 9840-AE2, 9843-AE2, 9840-AE3, and 9843-AE3

Note: AE1 systems are no longer supported.

|

Code fixes are now available, the minimum VRMF containing the fix depending on the code stream:

Fixed Code VRMF:

1.6 stream: 1.6.1.4

1.5 stream: 1.5.2.10

| N/A | FlashSystem 900 fixes are available at IBM’s Fix Central website. FlashSystem 840 is no longer supported.

Workarounds and Mitigations

Upgrade to the relevant remediated code version or later. Outside of upgrade, the attacker needs to be authenticated as a user on the system to exploit this vulnerability, so it may be mitigated by only configuring users that can be trusted with administrator privileges