IBM SECURITY ADVISORY First Issued: Mon Feb 1 14:05:28 CST 2021 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory4.asc https://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory4.asc ftp://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory4.asc Security Bulletin: Vulnerability in Curl affects PowerSC (CVE-2020-8231) =============================================================================== SUMMARY: There is a vulnerability in Curl that affects PowerSC. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2020-8231 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8231 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8231 DESCRIPTION: cURL libcurl could allow a remote attacker to obtain sensitive information, caused by the improper handling of the CURLOPT_CONNECT_ONLY option. The raw data is sent over that connection to the wrong destination. An attacker could exploit this vulnerability to obtain sensitive information. CVSS Base score: 5.3 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/186954 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) AFFECTED PRODUCTS AND VERSIONS: PowerSC 1.2 PowerSC 1.3 The vulnerabilities in the following filesets are being addressed: key_fileset = powerscStd.tnc_pm key_fileset = curl-7.71.1-1.aix6.1.ppc.rpm Fileset Lower Level Upper Level KEY --------------------------------------------------------------- powerscStd.tnc_pm 1.2.0.3 1.3.0.3 key_w_fs curl-7.71.1-1.aix6.1.ppc.rpm 7.19.4 7.71.1 key_w_fs Note: To find out whether the affected PowerSC filesets are installed on your systems, refer to the lslpp command found in AIX user's guide. To find out whether the affected curl filesets are installed on your systems, refer to the rpm command found in AIX user's guide. Example: lslpp -l | grep powerscStd Example: rpm -qa | grep curl REMEDIATION: A. FIXES Fixes are available. The fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix4.tar http://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix4.tar https://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix4.tar The link above is to a tar file containing this signed advisory, open source fix packages, and OpenSSL signatures for each package. To extract the fixes from the tar file: tar xvf curl_fix4.tar cd curl_fix4 Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 " command as the following: openssl dgst -sha256 filename KEY -------------------------------------------------------------------------------------------------------------- 2ca1bcb4bb5f05c8ff50b60589c36ac70da5b368495e61e239d05da2bb7dddef curl-7.72.0-1.aix6.1.ppc.rpm key_w_csum afc18de14b96962c23cd914f4d8d4d6ecc1be73c1c46809a8ee6dddfbc8e06ca libgcc-8.3.0-3.aix7.2.ppc.rpm key_w_csum These sums should match exactly. The OpenSSL signatures in the tar file and on this advisory can also be used to verify the integrity of the fixes. If the sums or signatures cannot be confirmed, contact IBM Support. openssl dgst -sha1 -verify -signature .sig openssl dgst -sha1 -verify -signature .sig Published advisory OpenSSL signature file location: http://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory4.asc.sig https://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory4.asc.sig ftp://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory4.asc.sig B. FIX AND INTERIM FIX INSTALLATION 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 extract the fixes from the tar file: tar xvf curl_fix3.tar cd curl_fix3 To install a fix package: rpm -ivh *.rpm rpm -Uvh *.rpm Interim fixes have had limited functional and regression testing but not the full regression testing that takes place for Service Packs; however, IBM does fully support them. 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 PowerSC Security Advisories via email, please visit "My Notifications": http://www.ibm.com/support/mynotifications https://www.ibm.com/support/mynotifications To view previously issued advisories, please visit: http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq https://www14.software.ibm.com/webapp/set2/subscriptions/onvdq Contact IBM Support for questions related to this announcement: http://ibm.com/support/ https://ibm.com/support/ To obtain the OpenSSL public key that can be used to verify the signed advisories and ifixes: Download the key from our web page: http://www.ibm.com/systems/resources/systems_p_os_aix_security_pubkey.txt https://www.ibm.com/systems/resources/systems_p_os_aix_security_pubkey.txt Please contact your local IBM AIX support center for any assistance. REFERENCES: Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide https://www.first.org/cvss/user-guide On-line Calculator v3: http://www.first.org/cvss/calculator/3.0 https://www.first.org/cvss/calculator/3.0 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Mon Feb 1 14:05:28 CST 2021 =============================================================================== *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.