IBM SECURITY ADVISORY First Issued: Wed May 3 09:23:25 CDT 2023 The most recent version of this document is available here: https://aix.software.ibm.com/aix/efixes/security/perl_advisory6.asc Security Bulletin: AIX is vulnerable to HTTP request smuggling due to Perl (CVE-2022-31081) =============================================================================== 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 https://cve.mitre.org/cgi-bin/cvename.cgi?name=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 Environmental Score*: Undefined 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: AIX 7.1, 7.2, 7.3 VIOS 3.1 The following fileset levels are vulnerable: key_fileset = aix Fileset Lower Level Upper Level KEY --------------------------------------------------------- perl.rte 5.28.0.0 5.28.1.4 key_w_fs perl.rte 5.34.0.0 5.34.1.1 key_w_fs 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 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 WORKAROUNDS AND MITIGATIONS: None. =============================================================================== CONTACT US: Note: Keywords labeled as KEY in this document are used for parsing purposes. If you would like to receive AIX Security Advisories via email, please visit "My Notifications": http://www.ibm.com/support/mynotifications Contact IBM Support for questions related to this announcement: https://ibm.com/support/ 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 advisories and ifixes: 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. REFERENCES: Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide On-line Calculator v3: http://www.first.org/cvss/calculator/3.0 RELATED INFORMATION: IBM Secure Engineering Web Portal http://www.ibm.com/security/secure-engineering/bulletins.html IBM Product Security Incident Response Blog https://www.ibm.com/blogs/psirt/ Security Bulletin: AIX is vulnerable to HTTP request smuggling due to Perl (CVE-2022-31081) https://www.ibm.com/support/pages/node/6988099 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Wed May 3 09:23:25 CDT 2023 =============================================================================== *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.