Security Bulletin: IBM App Connect Enterprise Certified Container may be vulnerable to denial of service due to CVE-2017-9047, CVE-2017-9048, CVE-2017-9049 and CVE-2017-9050

Summary

libxml2 is not used directly IBM App Connect Enterprise Certified Container but is present as part of the base operating system packages. IBM App Connect Enterprise Certified Container images may be vulnerable to denial of service. This bulletin provides patch information to address the reported vulnerabilities CVE-2017-9047, CVE-2017-9048, CVE-2017-9049 and CVE-2017-9050 in libxml2.

Vulnerability Details

CVEID:CVE-2017-9047
**DESCRIPTION:**libxml2 is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the xmlSnprintfElementContent function in valid.c. By sending a specially-crafted request, a local attacker could overflow a buffer and cause application to crash.
CVSS Base score: 5.9
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/126274 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)

CVEID:CVE-2017-9048
**DESCRIPTION:**libxml2 is vulnerable to a stack-based buffer overflow, caused by improper bounds checking of the strlen(buf) size in the xmlSnprintfElementContent function in valid.c. By sending a specially-crafted request, a local attacker could overflow a buffer and cause the application to crash.
CVSS Base score: 5.9
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/126275 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)

CVEID:CVE-2017-9049
**DESCRIPTION:**libxml2 is vulnerable to a heap-based buffer overflow, caused by a buffer over-read flaw in the xmlDictComputeFastKey function in dict.c. By sending a specially-crafted request, a local attacker could overflow a buffer and cause the application to crash.
CVSS Base score: 5.9
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/126276 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)

CVEID:CVE-2017-9050
**DESCRIPTION:**libxml2 is vulnerable to a heap-based buffer overflow, caused by a buffer over-read flaw in the xmlDictAddString function in dict.c. By sending a specially-crafted request, a local attacker could overflow a buffer and cause the application to crash.
CVSS Base score: 5.9
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/126277 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)

Affected Products and Versions

Remediation/Fixes

App Connect Enterprise Certified Container 4.1, 4.2, 5.0, 5.1, 5.2 and 6.0 (Continuous Delivery)

Upgrade to App Connect Enterprise Certified Container Operator version 6.1.0 or higher, and ensure that all components are at 12.0.6.0-r1 or higher. Documentation on the upgrade process is available at <https://www.ibm.com/docs/en/app-connect/containers_cd?topic=releases-upgrading-operator&gt;

App Connect Enterprise Certified Container 5.0 LTS (Long Term Support)

Upgrade to App Connect Enterprise Certified Container Operator version 5.0.1 or higher, and ensure that all components are at 12.0.6.0-r1-lts or higher. Documentation on the upgrade process is available at <https://www.ibm.com/docs/en/app-connect-contlts?topic=releases-upgrading-operator&gt;

Workarounds and Mitigations

None