Security Bulletin: OpenSSH for IBM i is vulnerable to an attacker executing arbitrary code due to a signal handler race condition. [CVE-2024-6387]

Summary

OpenSSH used by IBM i is vulnerable to a remote attacker executing arbitrary code due to a signal handler race condition as described in the vulnerability details section. This bulletin identifies the steps to take to address the vulnerability as described in the remediation/fixes section.

Vulnerability Details

CVEID:CVE-2024-6387
**DESCRIPTION:**OpenSSH could allow a remote attacker to execute arbitrary code on the system, caused by a signal handler race condition. By sending a specially crafted request, an attacker could exploit this vulnerability to execute arbitrary code with root privileges on glibc-based Linux systems.
CVSS Base score: 8.1
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/296064 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

Remediation/Fixes

The issue can be addressed by applying a PTF to IBM i. IBM i 7.5 will be fixed.

The IBM i 5733-SC1 PTF number resolves the vulnerability.

IBM i Release| 5733-SC1
PTF Number| PTF Download Link
—|—|—
7.5| SJ01687 | <https://www.ibm.com/mysupport/s/fix-information?legacy=SJ01687&gt;

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