IBM SECURITY ADVISORY First Issued: Thu Jun 15 10:12:11 CDT 2023 The most recent version of this document is available here: https://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory11.asc Security Bulletin: Multiple vulnerabilities in Curl affect PowerSC =============================================================================== SUMMARY: There are multiple vulnerabilities in Curl that affect PowerSC. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2023-27534 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27534 DESCRIPTION: cURL libcurl could allow a remote attacker to obtain sensitive information, caused by a SFTP path ~ resolving discrepancy flaw. By sending a specially crafted request using a tilde (~) character, an attacker could exploit this vulnerability to obtain sensitive information from other directory, 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/250529 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-2022-43552 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-43552 DESCRIPTION: cURL libcurl is vulnerable to a denial of service, caused by a use-after-free flaw when using an HTTP proxy. By sending a specially-crafted request, a remote attacker could exploit this vulnerability to cause a denial of service condition. CVSS Base score: 5.9 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/242799 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2023-23914 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-23914 DESCRIPTION: cURL libcurl could allow a remote attacker to obtain sensitive information, caused by a flaw in the HSTS function when multiple URLs are requested serially. By sniffing the network traffic, 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/247433 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-2023-23916 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-23916 DESCRIPTION: cURL libcurl is vulnerable to a denial of service, caused by a flaw in the decompression chain implementation. By sending a specially-crafted request, a remote attacker could exploit this vulnerability to cause memory errors, and results in a denial of service condition. CVSS Base score: 7.5 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/247437 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2023-27533 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27533 DESCRIPTION: cURL libcurl could allow a remote attacker to bypass security restrictions, caused by a TELNET option IAC injection flaw. By sending a specially crafted request, an attacker could exploit this vulnerability to pass on user name and "telnet options" for the server negotiation. CVSS Base score: 8.2 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/250476 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N) CVEID: CVE-2023-23915 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-23915 DESCRIPTION: cURL libcurl could allow a remote attacker to obtain sensitive information, caused by a flaw in the HSTS function when multiple URLs are requested in parallel. By sniffing the network traffic, 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/247436 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-2023-27536 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27536 DESCRIPTION: cURL libcurl could allow a remote attacker to bypass security restrictions, caused by a GSS delegation too eager connection re-use flaw. By sending a specially crafted request, an attacker could exploit this vulnerability to reuse a previously created connection even when the GSS delegation. CVSS Base score: 5.9 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/250531 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N) CVEID: CVE-2022-43551 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-43551 DESCRIPTION: cURL libcurl could allow a remote attacker to bypass security restrictions, caused by a flaw when the host name in the given URL first uses IDN characters that get replaced to ASCII counterparts as part of the IDN conversion. By sending a specially-crafted request, an attacker could exploit this vulnerability to bypass HSTS check. CVSS Base score: 7.5 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/242798 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N) CVEID: CVE-2023-27537 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27537 DESCRIPTION: cURL libcurl is vulnerable to a denial of service, caused by a double free or use-after-free flaw when sharing HSTS data between separate "handles". By sending a specially crafted request, a remote attacker could exploit this vulnerability to cause a denial of service condition. CVSS Base score: 7.5 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/250532 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2023-27535 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27535 DESCRIPTION: cURL libcurl could allow a remote attacker to bypass security restrictions, caused by a FTP too eager connection reuse flaw. By sending a specially crafted request, an attacker could exploit this vulnerability to reuse a previously created FTP connection. CVSS Base score: 5.9 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/250530 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N) CVEID: CVE-2023-27538 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27538 DESCRIPTION: cURL libcurl could allow a local attacker to bypass security restrictions, caused by a SSH connection too eager reuse still flaw. By sending a specially crafted request, an attacker could exploit this vulnerability to reuse a previously created connection even when an SSH related option had been changed. CVSS Base score: 4 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/250533 for the current score. CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N) 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-8.0.1-1.aix7.1.ppc.rpm Fileset Lower Level Upper Level KEY --------------------------------------------------------------- powerscStd.tnc_pm 1.3.0.4 2.1.0.5 key_w_fs curl-8.0.1-1.aix7.1.ppc.rpm 7.19.4 7.86.0 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 IBM strongly recommends addressing the vulnerability now. Fixes are available. The fixes can be downloaded via ftp or http from: https://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix11.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_fix11.tar cd curl_fix11 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 ------------------------------------------------------------------------------------------------------------------------ 767038cfaa0e3469c7008f5292f78aac2fc79b5a354ece924d81b40af74e3df8 curl-8.0.1-1.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: https://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory11.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_fix11.tar cd curl_fix11 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": https://www.ibm.com/support/mynotifications Contact IBM Support for questions related to this announcement: 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: https://www.first.org/cvss/user-guide On-line Calculator v3: https://www.first.org/cvss/calculator/3.0 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Thu Jun 15 10:12:11 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.