Security Bulletin
Summary
A vulnerability in libwww-perl could allow an attacker to poison web caches, bypass web application firewall protection, and conduct XSS attacks (CVE-2022-31081). AIX uses Perl in various operating system components.
Vulnerability Details
CVEID: CVE-2022-31081
DESCRIPTION: Libwww is vulnerable to HTTP request smuggling, caused by an unspecified flaw. By sending a specially-crafted HTTP(S) transfer-encoding request header, an attacker could exploit this vulnerability to poison the web cache, bypass web application firewall protection, and conduct XSS attacks.
CVSS Base score: 7.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/229880 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| AIX | 7.1 |
| AIX | 7.2 |
| AIX | 7.3 |
| VIOS | 3.1 |
The following fileset levels are vulnerable:
| Fileset | Lower Level | Upper Level |
| perl.rte | 5.28.0.0 | 5.28.1.4 |
| perl.rte | 5.34.0.0 | 5.34.1.1 |
To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in AIX user's guide.
Example: lslpp -L | grep -i perl.rte
Remediation/Fixes
FIXES
IBM strongly recommends addressing the vulnerability now.
AIX and VIOS fixes are available.
The AIX and VIOS fixes can be downloaded via https from, under 'Perl - Perl Version 5 Runtime':
https://www.ibm.com/resources/mrs/assets?source=aixbp
For AIX 7.1 TL5, 7.2 TL5, and 7.3 TL0, and for VIOS 3.1.2, 3.1.3, and 3.1.4:
perl.rte.5.28.1.5
For AIX 7.3 TL1:
perl.rte.5.34.1.2
Verify you have retrieved the fixes intact:
The checksums below were generated using the "openssl dgst -sha256 [filename]" command as the following:
| openssl dgst -sha256 | filename |
| 48d2ae8e064e5dab009b7292ba1687428d790edfa5ff897cebc0ec0e2c30b948 | perl.rte.5.28.1.5 |
| 60559c203b2cbd1c9a3a11df82059ef59bb52edf29a3ca4d8e59a22b1664511c | perl.rte.5.34.1.2 |
IMPORTANT: If possible, it is recommended that a mksysb backup of the system be created. Verify it is both bootable and readable before proceeding.
To preview the fix installation:
installp -apYd . perl
To install the fix package:
installp -aXYd . perl
CONTACT US
For information on how to securely verify AIX security bulletins and fixes:
https://www.ibm.com/support/pages/node/6985269
To obtain the OpenSSL public key that can be used to verify the signed advisory, download the key from our web page:
ftp://ftp.software.ibm.com/systems/power/AIX/systems_p_os_aix_security_pubkey.txt
https://aix.software.ibm.com/aix/efixes/security/systems_p_os_aix_security_pubkey.txt
To verify the AIX/VIOS security bulletin:
Published advisory OpenSSL signature file location: https://aix.software.ibm.com/aix/efixes/security/perl_advisory6.asc.sig
openssl dgst -sha256 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file]
Please contact your local IBM AIX support center for any assistance:
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Change History
3 May 2023: 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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Document Information
Modified date:
03 May 2023
UID
ibm16988099