Security Bulletin: Multiple Vulnerabilities in Expat component shipped with IBM Rational ClearCase [CVE-2022-40674, CVE-2022-43680]

Summary

libexpat is a stream-oriented XML parser library used by IBM Rational ClearCase. IBM Rational ClearCase has addressed the applicable CVEs. [CVE-2022-40674, CVE-2022-43680]

Vulnerability Details

CVEID:CVE-2022-43680
**DESCRIPTION:**libexpat is vulnerable to a denial of service, caused by a use-after free created by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate in out-of-memory situations. A remote attacker could exploit this vulnerability to cause a denial of service.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/238951 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)

CVEID:CVE-2022-40674
**DESCRIPTION:**libexpat could allow a remote attacker to execute arbitrary code on the system, caused by a use-after-free in the doContent function in xmlparse.c. An attacker could exploit this vulnerability to execute arbitrary code on the system.
CVSS Base score: 9.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/236116 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

Remediation/Fixes

Apply a fix pack as listed in the table below. The fix pack includes Expat 2.5.0**.**

Affected Versions

|

Applying the fix

—|—
9.1 through 9.1.0.4| Install Rational ClearCase Fix Pack 4 (9.1.0.4) for 9.1
9.0.2 through 9.0.2.7| Install Rational ClearCase Fix Pack 7 (9.0.2.7) for 9.0.2

10.0.0 through 10.0.0.1

| Install Rational ClearCase Fix Pack 1 (10.0.0.1) for 10.0.0

For 9.0.1.X and earlier releases, IBM recommends upgrading to a fixed, supported version/release/platform of the product.

Workarounds and Mitigations

None