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

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

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 9.1.0.3| Install Rational ClearCase Fix Pack 3 (9.1.0.3) for 9.1
9.0.2 through 9.0.2.6| Install 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