IBM SECURITY ADVISORY First Issued: Mon Nov 18 10:46:34 CST 2019 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory.asc https://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory.asc ftp://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory.asc Security Bulletin: Vulnerabilities in Curl affect PowerSC (CVE-2019-5435, CVE-2019-5436) =============================================================================== SUMMARY: There are vulnerabilities in Curl that affect PowerSC. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2019-5435 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5435 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5435 DESCRIPTION: An integer overflow in curl's URL API results in a buffer overflow in libcurl 7.62.0 to and including 7.64.1. CVSS Base Score: 7.3 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/161429 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L) CVEID: CVE-2019-5436 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5436 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5436 DESCRIPTION: A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl versions 7.19.4 through 7.64.1. CVSS Base Score: 6.3 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/161431 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: PowerSC 1.2 The vulnerabilities in the following filesets are being addressed: key_fileset = powerscStd.tnc_pm key_fileset = curl-7.65.1-1.aix6.1.ppc.rpm Fileset Lower Level Upper Level KEY --------------------------------------------------------------- powerscStd.tnc_pm 1.2.0.0 1.2.0.3 key_w_fs curl-7.65.1-1.aix6.1.ppc.rpm 7.19.4 7.64.1 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_fix.tar http://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix.tar https://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix.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_fix.tar cd curl_fix 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 ---------------------------------------------------------------------------------------------------------- 56e394405836f1bdf7d188cef30adf5f6151fe594b39576dfbd953435e192569 ca-certificates-2016.10.7-2.aix6.1.ppc.rpm key_w_csum 5f01da544ae221c3f98ecd864782597b326f7838bb759cbb44b8366cad2eaeee curl-7.65.1-1.aix6.1.ppc.rpm key_w_csum 3ef01f3aea3e62ce402158ea892dfdb101d2c2f1c06256c6a245dc3126610bc0 db-6.2.32-2.aix6.1.ppc.rpm key_w_csum 7d1b39e1b8ab29a33edf9bb8fb589e071a6e0e06b69182f8a08776f497715f49 libs-1.16.1-2.aix6.1.ppc.rpm key_w_csum dfd52c9b162b075abdaea908910ade3ee13d923e36a7e45cf6e1308ef5e62b52 libgcc-8.1.0-2.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_advisory.asc.sig https://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory.asc.sig ftp://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory.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_fix.tar cd curl_fix 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 Nov 18 10:46:34 CST 2019 =============================================================================== *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.