Security Bulletin: Vulnerabilities in Expat component shipped with IBM Rational ClearCase (CVE-2019-15903)

Security Bulletin

Summary

IBM Rational ClearCase is affected by an Expat library heap-based buffer over-read in XML_GetCurrentLineNumber leading to a denial of service vulnerability

Vulnerability Details

CVEID: CVE-2019-15903
DESCRIPTION: libexpat is vulnerable to a denial of service, caused by a heap-based buffer over-read in XML_GetCurrentLineNumber. By using a specially-crafted XML input, a remote attacker could exploit this vulnerability to cause the application to crash.
CVSS Base score: 5.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/166560 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

Affected Products and Versions

The Expat component is used in the ClearCase full client, in the xmldiffmerge and clearmrgman graphical interfaces.

ClearCase client version	Status
9.0.1 through 9.0.1.8	Affected
9.0 through 9.0.0.6	Affected
8.0.1 through 8.0.1.22	Affected
8.0 through 8.0.0.21	Affected

Remediation/Fixes

The solution is to upgrade to a fix pack of ClearCase that has a fix in the Expat component.

Affected Versions	Applying the fix
9.0.1 through 9.0.1.8 9.0 through 9.0.0.6	Install Rational ClearCase Fix Pack 9 (9.0.1.9) for 9.0.1
8.0.1 through 8.0.1.22 8.0 through 8.0.0.21	Install Rational ClearCase Fix Pack 23 (8.0.1.23) for 8.0.1

For 8.0.x and earlier releases, IBM recommends upgrading to a fixed, supported version/release/platform of the product.

Workarounds and Mitigations

None

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Important Note

IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk.

References

Complete CVSS v3 Guide
On-line Calculator v3

Off

Libexpat (publicly disclosed vulnerability) CVE-2019-15903

Change History

27 March 2020: Original copy published

*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.

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Tips

Security Bulletin: Vulnerabilities in Expat component shipped with IBM Rational ClearCase (CVE-2019-15903)