Security Bulletin: Zlib for IBM i is vulnerable to a buffer overflow issue during inflate (CVE-2022-37434)

Summary

Zlib for IBM i is vulnerable to a heap-based buffer overflow during inflate as described in the vulnerability details section. IBM i has addressed the vulnerability in Zlib with a fix as described in the remediation/fixes section.

Vulnerability Details

CVEID:CVE-2022-37434
**DESCRIPTION:**zlib is vulnerable to a heap-based buffer overflow, caused by improper bounds checking by inflate in inflate.c. By using a large gzip header extra field, a remote attacker could overflow a buffer and execute arbitrary code on the system.
CVSS Base score: 7.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/232849 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)

Affected Products and Versions

Remediation/Fixes

The issue can be fixed by applying a PTF to IBM i. IBM i releases 7.5, 7.4, 7.3, and 7.2 will be fixed.

The IBM i PTF number containing the fix for the CVE :

IBM i Release| 5733-SC1
PTF Number| PTF Download Link
—|—|—
7.5| SI81292| SI81292
7.4, 7.3, 7.2| SI81291| SI81291

<https://www.ibm.com/support/fixcentral&gt;

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