Security Bulletin: IBM HTTP Server (powered by Apache) for IBM i is vulnerable to a remote attacker causing a denial of service, executing arbitrary code, and mapping URLs to filesystem locations due to multiple vulnerabilities.

Security Bulletin

Summary

IBM HTTP Server (powered by Apache) for IBM i is vulnerable to a remote attacker causing a denial of service due to NULL pointer dereference [CVE-2024-38477], executing arbitrary code due to an encoding issue in mod_rewrite [CVE-2024-38474], and improper escaping in mod_rewrite resulting in access to files [CVE-2024-38475] as described in the vulnerability details section. This bulletin identifies the steps to take to address the vulnerabilities as described in the remediation/fixes section.

Vulnerability Details

CVEID: CVE-2024-38477
DESCRIPTION: Apache HTTP Server is vulnerable to a denial of service, caused by a NULL pointer dereference flaw in mod_proxy. By sending a specially crafted request, a remote attacker could exploit this vulnerability to cause a denial of service condition.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/296122 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-2024-38474
DESCRIPTION: Apache HTTP Server could allow a remote attacker to execute arbitrary code on the system, caused by a substitution encoding issue in mod_rewrite. By sending a specially crafted request, an attacker could exploit this vulnerability to execute scripts in directories permitted by the configuration.
CVSS Base score: 8.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/296125 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N)

CVEID: CVE-2024-38475
DESCRIPTION: Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to map URLs to filesystem locations that are permitted to be served by the server but are not intentionally/directly reachable by any URL, resulting in code execution or source code disclosure. Substitutions in server context that use a backreferences or variables as the first segment of the substitution are affected. Some unsafe RewiteRules will be broken by this change and the rewrite flag "UnsafePrefixStat" can be used to opt back in once ensuring the substitution is appropriately constrained.
CVSS Base score: 8.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/296124 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N)

Affected Products and Versions

Affected Product(s)	Version(s)
IBM i	7.5
IBM i	7.4
IBM i	7.3
IBM i	7.2

Remediation/Fixes

The issue can be fixed by applying a PTF to IBM i. IBM i releases 7.5, 7.4, 7.3, and 7.2 will be fixed.

The IBM i PTF numbers contain the fixes for the vulnerabilities.

IBM i Release	5770-DG1 PTF Number	PTF Download Link
7.5	SJ01738 SJ02179	https://www.ibm.com/mysupport/s/fix-information?legacy=SJ01738 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ02179
7.4	SJ01739 SJ02177	https://www.ibm.com/mysupport/s/fix-information?legacy=SJ01739 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ02177
7.3	SJ01752 SJ02176	https://www.ibm.com/mysupport/s/fix-information?legacy=SJ01752 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ02176
7.2	SJ01751 SJ02130	https://www.ibm.com/mysupport/s/fix-information?legacy=SJ01751 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ02130

https://www.ibm.com/support/fixcentral

Important note: IBM recommends that all users running unsupported versions of affected products upgrade to supported and fixed version of affected products.

Workarounds and Mitigations

None

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References

Complete CVSS v3 Guide
On-line Calculator v3

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Acknowledgement

Change History

01 Oct 2024: 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

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Document Location

Worldwide

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Tips

Security Bulletin: IBM HTTP Server (powered by Apache) for IBM i is vulnerable to a remote attacker causing a denial of service, executing arbitrary code, and mapping URLs to filesystem locations due to multiple vulnerabilities.