Security Bulletin
Summary
There are multiple vulnerabilities in the Expat library affecting the IBM HTTP Server used by IBM WebSphere Application Server (CVE-2022-25313, CVE-2022-25315, CVE-2022-25235,CVE-2022-25236). This has been addressed.
Vulnerability Details
CVEID: CVE-2022-25236
DESCRIPTION: libexpat is vulnerable to a denial of service, caused by improper protection against insertion of namesep characters into namespace URIs in xmlparse.c. By sending a specially-crafted request, a remote attacker could exploit this vulnerability to cause a denial of service condition.
CVSS Base score: 5.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/219784 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)
CVEID: CVE-2022-25235
DESCRIPTION: libexpat is vulnerable to a denial of service, caused by improper input validation in xmltok_impl.c. By persuading a victim to open a specially-crafted content with malformed encoding, a remote attacker could exploit this vulnerability to cause a denial of service condition.
CVSS Base score: 3.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/219782 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L)
CVEID: CVE-2022-25313
DESCRIPTION: libexpat is vulnerable to a denial of service, caused by stack exhaustion in build_model. By persuading a victim to open a specially-crafted file, a remote attacker could exploit this vulnerability using a large nesting depth in the DTD element to cause a denial of service.
CVSS Base score: 5.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/219947 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)
CVEID: CVE-2022-25315
DESCRIPTION: libexpat could allow a remote attacker to execute arbitrary code on the system, caused by an integer overflow in storeRawNames. By persuading a victim to open a specially-crafted file, an attacker could overflow a buffer and execute arbitrary code on the system.
CVSS Base score: 7.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/219945 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)
Affected Products and Versions
This vulnerability affects the following version and release of IBM HTTP Server (powered by Apache) component in all editions of IBM WebSphere Application Server and bundling products.
| Affected Product(s) | Version(s) |
| IBM HTTP Server | 9.0 |
| IBM HTTP Server | 8.5 |
| IBM HTTP Server | 8.0 |
| IBM HTTP Server | 7.0 |
Remediation/Fixes
IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains APAR PH44271.
For IBM HTTP Server used by IBM WebSphere Application Server:
For V9.0.0.0 through 9.0.5.11:
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH44271
--OR--
· Apply Fix Pack 9.0.5.12 or later (targeted availability 2Q2022).
For V8.5.0.0 through 8.5.5.21:
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH44271
--OR--
· Apply Fix Pack 8.5.5.22 or later (targeted availability 3Q2022).
For V8.0.0.0 through 8.0.0.15:
· Upgrade to 8.0.0.15 and then apply Interim Fix PH44271
For V7.0.0.0 through 7.0.0.45:
· Upgrade to 7.0.0.45 and then apply Interim Fix PH44271
Additional interim fixes may be available and linked off the interim fix download page.
IBM HTTP Server V7.0 and V8.0 are no longer in full support; IBM recommends upgrading to a fixed, supported version/release/platform of the product.
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.
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
02 Mar 2022: Initial Publication
15 Mar 2022: Updated target fix pack for v9.0 and added interim fix.
*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
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Document Information
Modified date:
15 March 2022
UID
ibm16560814