Security Bulletin: CICS Transaction Gateway Containers are vulnerable to unwanted system calls such as unshare() (CVE-2022-0185).

Summary

CICS Transaction Gateway Containers are vulnerable to CVE-2022-0185 if the SECCOMP profile is not configured so as to disable unwanted system calls such as unshare().

Vulnerability Details

CVEID:CVE-2022-0185
**DESCRIPTION:**Linux Kernel is vulnerable to a heap-based buffer overflow, caused by an integer underflow in the legacy_parse_param function in fs/fs_context.c. By sending a specially-crafted request, a local authenticated attacker could overflow a buffer and execute arbitrary code on the system with root privileges.
CVSS Base score: 7.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/217455 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

Remediation/Fixes

IBM strongly recommends addressing the vulnerability now.

Product

| VRMF|Platforms|Remediation/First Fix
—|—|—|—
CICS Transaction Gateway for Multiplatforms| 9.3.0.0| Linux on IBM Z container |

System calls directly interact with underlying OS kernel which enables an attacker to perform malicious unintended activity once a threat actor gains access into the cluster. Seccomp restricts an attacker’s access to a limited set of syscalls from the CICS TG container. Seccomp for CICS Transaction Gateway containers can be created by following the instructions in Seccomp profiles for CICS Transaction Gateway Containers.

CICS Transaction Gateway for Multiplatforms | 9.3.0.0| Linux on Intel container

Workarounds and Mitigations

None