Security Bulletin: Zlib for IBM i is vulnerable to a denial of service attack due to memory corruption (CVE-2018-25032)

Security Bulletin

Summary

Zlib for IBM i is vulnerable to a denial of service attack due to memory corruption 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-2018-25032
DESCRIPTION: Zlib is vulnerable to a denial of service, caused by a memory corruption in the deflate operation. By using many distant matches, a remote attacker could exploit this vulnerability to cause the application to crash.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/222615 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

Affected Product(s)	Version(s)
IBM i	7.5
IBM i	7.4
IBM i	7.3
IBM i	7.2

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	SI80205	SI80205
7.4, 7.3, 7.2	SI80203	SI80203

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

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References

Complete CVSS v3 Guide
On-line Calculator v3

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Change History

28 Jun 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

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

Document Location

Worldwide

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Tips

Security Bulletin: Zlib for IBM i is vulnerable to a denial of service attack due to memory corruption (CVE-2018-25032)