To debug the IBM Verify Gateway (IVG) PAM components, customers can add "trace-file" parameters in the PAM configuration so that .log files are written to the /tmp directory. These debug logs potentially contain sensitive information, and yet they default to world readable. They should have stricter access permissions. As of v1.0.1 of IVG for AIX PAM, and v1.0.2 of IVG for Linux PAM, the logs are no longer world readable.
DESCRIPTION: IBM Verify Gateway (IVG) could disclose potentially sensitive information to an authenticated user due to world readable log files.
CVSS Base score: 3.1
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/179484 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N)
Affected Products and Versions
|IBM Verify Gateway (IVG)||PAM 1.0.0, 1.0.1|
Log in to IBM X-Force Exchange / App Exchange and download and install the latest IBM Security Verify Gateway (renamed from IBM Verify Gateway) PAM components. Specifically:
- IBM Security Verify Gateway for AIX PAM (Pluggable Authentication Modules) v1.0.1 at https://exchange.xforce.ibmcloud.com/hub/extension/e506cf66c5f51340cef3e1b40e8b4840
- IBM Security Verify Gateway for Linux PAM (Pluggable Authentication Modules) v1.0.2 at https://exchange.xforce.ibmcloud.com/hub/extension/80eca9a1094b416db69dfff40eb10c5a
Workarounds and Mitigations
Use the chmod command to restrict access to PAM's "trace-file" logs in the /tmp directory.
Get Notified about Future Security Bulletins
Jonathan Fitz-Gerald, John Zuccato, Rodney Ryan, Chris Shepherd, Nathan Roane, Kamil Sarbinowski, Vince Dragnea, Troy Fisher and Elaheh Samani from IBM X-Force Ethical Hacking Team.
15 Jul 2020: 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.
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.
23 July 2020