IBM Support

Security Bulletin: IBM i is vulnerable to bypass security restrictions due to Samba SMB1 (CVE-2021-43566 and CVE-2021-44141)

Security Bulletin


Summary

Samba is available on IBM i to provide file system access. Samba is vulnerable to the issues described in the vulnerability details section. IBM i has addressed the applicable CVEs in the Samba implementation by providing a fix.

Vulnerability Details

CVEID:   CVE-2021-43566
DESCRIPTION:   Samba could allow a remote authenticated attacker to bypass security restrictions, caused by a symlink race error. By using a specially-crafted SMB1 or NFS symlink, an attacker could exploit this vulnerability to create a directory in a part of the server file system not exported under the share definition.
CVSS Base score: 2.6
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/217058 for the current score.
CVSS Vector: (CVSS:3.0/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N)

CVEID:   CVE-2021-44141
DESCRIPTION:   Samba could allow a remote authenticated attacker to obtain sensitive information. By querying a symlink inside the exported share using SMB1 with unix extensions turned on, an attacker could exploit this vulnerability to discover if a named or directory exists on the filesystem outside of the exported share.
CVSS Base score: 6.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/218468 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)

Affected Products and Versions

Affected Product(s)Version(s)
IBM i7.4
IBM i7.3

 


Remediation/Fixes

The issues can be fixed by applying a PTF to IBM i.  Releases 7.4 and 7.3 of IBM i will be fixed.
The IBM i PTF numbers containing the fix for the CVEs are:  

Release 7.4 -  SI78680
Release 7.3 -  SI78679

https://www.ibm.com/support/fixcentral

Important note: IBM recommends that all users running unsupported versions of affected products upgrade to supported and fixed version of affected products.

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

References

Off

Change History

28 Feb 2022: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Document Location

Worldwide

[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SS9QQS","label":"IBM i 7.4"},"Component":"N\/A","Platform":[{"code":"PF012","label":"IBM i"}],"Version":"7.4","Edition":"N\/A","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SWG60","label":"IBM i"},"Component":"N\/A","Platform":[{"code":"PF012","label":"IBM i"}],"Version":"7.4,7.3,7.2","Edition":"N\/A","Line of Business":{"code":"LOB57","label":"Power"}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSTS2D","label":"IBM i 7.3"},"Component":"N\/A","Platform":[{"code":"PF012","label":"IBM i"}],"Version":"7.3","Edition":"N\/A","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSC5L9","label":"IBM i 7.2"},"Component":"N\/A","Platform":[{"code":"PF012","label":"IBM i"}],"Version":"7.2","Edition":"N\/A","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]

Document Information

Modified date:
02 March 2022

UID

ibm16560396