Security Bulletin
Summary
There are multiple vulnerabilities in Curl that affect PowerSC.
Vulnerability Details
CVEID: 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
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
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
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
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
| Affected Product(s) | Version(s) |
| PowerSC | 1.3, 2.0, 2.1 |
The vulnerabilities in the following filesets are being addressed:
| Fileset | Lower Level | Upper Level |
| powerscStd.tnc_pm | 1.3.0.4 | 2.1.0.4 |
| curl-7.85.0-1.aix7.1.ppc.rpm | 7.19.4 | 7.83.1 |
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/Fixes
A. FIXES
IBM highly recommends addressing the vulnerabilities now.
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 |
| 77a5e41cca844667283272b571317056f79302d983d75c627bbeaca5d3845172 | curl-7.85.0-1.aix7.1.ppc.rpm |
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
Get Notified about Future Security Bulletins
References
Change History
22 Dec 2022: Initial Publication
*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. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.
Document Location
Worldwide
Was this topic helpful?
Document Information
Modified date:
19 January 2023
UID
ibm16856467