IBM Support

Security Bulletin: Multiple Vulnerabilities in Expat component shipped with IBM Rational ClearCase ( CVE-2021-45960, CVE-2021-46143 )

Security Bulletin


Summary

libexpat is a stream-oriented XML parser library used by IBM Rational ClearCase. IBM Rational ClearCase has addressed the applicable CVEs.

Vulnerability Details

CVEID:   CVE-2021-46143
DESCRIPTION:   Expat could allow a remote attacker to execute arbitrary code on the system, caused by an integer overflow of m_groupSize in doProlog in xmlparse.c. By persuading a victim to open a specially-crafted file, an attacker could exploit this vulnerability to execute arbitrary code on the system.
CVSS Base score: 7.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/216875 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)

CVEID:   CVE-2021-45960
DESCRIPTION:   Expat (aka libexpat) is vulnerable to a denial of service, caused by a realloc misbehavior issue in the storeAtts function in xmlparse.c. By persuading a victim to open a specially-crafted XML content, a remote attacker could exploit this vulnerability to cause a the application to crash.
CVSS Base score: 5.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/216473 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)

Affected Products and Versions

Affected Product(s)Version(s)
IBM Rational ClearCase8.0.0
IBM Rational ClearCase9.0
IBM Rational ClearCase9.0.1
IBM Rational ClearCase9.1
IBM Rational ClearCase9.0.2
IBM Rational ClearCase8.0.1

Remediation/Fixes

Apply a fix pack as listed in the table below. The fix pack includes Expat 2.4.6.

Affected Versions
Applying the fix
9.1 through 9.1.0.3Install Rational ClearCase Fix Pack 3 (9.1.0.3) for 9.1
9.0.2 through 9.0.2.6Install Rational ClearCase Fix Pack 6 (9.0.2.6) for 9.0.2
9.0.1 through 9.0.1.14
9.0 through 9.0.0.6
Install Rational ClearCase Fix Pack 14 (9.0.1.14) for 9.0.1

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

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

Subscribe to My Notifications to be notified of important product support alerts like this.

References

Complete CVSS v3 Guide
On-line Calculator v3

Off

libexpat Home page

libexpat project changes

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

25 Jul 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

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSSH27","label":"Rational ClearCase"},"Component":"","Platform":[{"code":"PF016","label":"Linux"},{"code":"PF027","label":"Solaris"},{"code":"PF002","label":"AIX"},{"code":"PF010","label":"HP-UX"},{"code":"PF033","label":"Windows"}],"Version":"8.0.0, 8.0.1, 9.0.0, 9.0.1, 9.0.2, 9.1","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
25 July 2022

UID

ibm16606251

Page Feedback