AIX is vulnerable to HTTP request smuggling due to Perl

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://vulners.com/cve/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.