IBM SECURITY ADVISORY First Issued: Thu Jan 19 13:15:23 CST 2023 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory9.asc https://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory9.asc ftp://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory9.asc Security Bulletin: Multiple vulnerabilities in Curl affect PowerSC =============================================================================== SUMMARY: There are multiple vulnerabilities in Curl that affect PowerSC. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2022-32206 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32206 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32206 DESCRIPTION: cURL libcurl is vulnerable to a denial of service, caused by a flaw in the number of acceptable "links" in the "chained" HTTP compression algorithms. By persuading a victim to connect a specially-crafted server, a remote attacker could exploit this vulnerability to insert a virtually unlimited number of compression steps, and results in a denial of service condition. CVSS Base score: 4.3 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/229740 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L) CVEID: CVE-2022-32207 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32207 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32207 DESCRIPTION: cURL libcurl could allow a remote attacker to obtain sensitive information, caused by improper preservation of permissions when saving cookies, alt-svc and hsts data to local files. By sending a specially-crafted request, an attacker could exploit this vulnerability to obtain sensitive information, and use this information to launch further attacks against the affected system. CVSS Base score: 7.5 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/229741 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) CVEID: CVE-2022-32208 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32208 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32208 DESCRIPTION: cURL libcurl is vulnerable to a man-in-the-middle attack, caused by a flaw in the handling of message verification failures. An attacker could exploit this vulnerability to launch a man-in-the-middle attack and gain access to the communication channel between endpoints to inject data to the client. CVSS Base score: 3.5 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/229742 for the current score. CVSS Vector: (CVSS:3.0/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N) CVEID: CVE-2022-32205 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32205 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32205 DESCRIPTION: cURL libcurl is vulnerable to a denial of service, caused by an issue with the ability to set excessive amounts of Set-Cookie: headers in a HTTP response to curl by a server. By persuading a victim to connect a specially-crafted server, a remote attacker could exploit this vulnerability to create requests that become larger than the threshold, and results in a denial of service condition. CVSS Base score: 4.3 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/229739 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L) CVEID: CVE-2022-35252 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-35252 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-35252 DESCRIPTION: cURL libcurl is vulnerable to a denial of service, caused by a flaw when cookies contain control codes are later sent back to an HTTP(S) server. By sending a specially-crafted request, a remote attacker could exploit this vulnerability to cause a "sister site" to deny service to siblings. CVSS Base score: 5.3 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/234980 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) AFFECTED PRODUCTS AND VERSIONS: PowerSC 1.3, 2.0, 2.1 The vulnerabilities in the following filesets are being addressed: key_fileset = powerscStd.tnc_pm key_fileset = curl-7.85.0-1.aix7.1.ppc.rpm Fileset Lower Level Upper Level KEY --------------------------------------------------------------- powerscStd.tnc_pm 1.3.0.4 2.1.0.4 key_w_fs curl-7.85.0-1.aix7.1.ppc.rpm 7.19.4 7.83.1 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_fix9.tar http://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix9.tar https://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix9.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_fix9.tar cd curl_fix9 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 KEY ------------------------------------------------------------------------------------------------------------------------ 77a5e41cca844667283272b571317056f79302d983d75c627bbeaca5d3845172 curl-7.85.0-1.aix7.1.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 -sha256 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file] openssl dgst -sha256 -verify [pubkey_file] -signature [ifix_file].sig [ifix_file] Published advisory OpenSSL signature file location: http://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory9.asc.sig https://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory9.asc.sig ftp://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory9.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_fix9.tar cd curl_fix9 To install a fix package: rpm -ivh *.rpm rpm -Uvh *.rpm To install any dependencies along with the fix package: yum update curl 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 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: ftp://ftp.software.ibm.com/systems/power/AIX/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: Thu Jan 19 13:15:23 CST 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.