Vulnerability in cURL libcurl could allow a remote attacker to bypass security restriction (CVE-2022-32221). AIX uses cURL libcurl as part of LV/PV encryption integration with HPCS.
CVEID:CVE-2022-32221
**DESCRIPTION:**cURL libcurl could allow a remote attacker to bypass security restrictions, caused by a flaw when using the read callback (CURLOPT_READFUNCTION) to ask for data to send. By sending a specially-crafted request, an attacker could exploit this vulnerability to send wrong data or doing a use-after-free is not present in libcurl code.
CVSS Base score: 8.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/239058 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L)
Affected Product(s) | Version(s) |
---|---|
AIX | 7.3 TL1 |
The following fileset levels are vulnerable:
Fileset | Lower Level | Upper Level |
---|
oss.lib.libcurl
| 7.79.1.0| 7.79.1.0
Note: This bulletin does not apply to versions of curl installed from the AIX Toolbox.
To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in AIX userโs guide.
Example: lslpp -L | grep -i oss.lib.libcurl
**A.**FIXES
IBM strongly recommends addressing the vulnerability now.
AIX and VIOS fixes are available.
The AIX and VIOS fixes can be downloaded via https from:
<https://aix.software.ibm.com/aix/efixes/security/curl_fix.tar>
The link above is to a tar file containing this signed advisory, fix packages, and OpenSSL signatures for each package. The fixes below include prerequisite checking. This will enforce the correct mapping between the fixes and AIX Technology Levels.
AIX Level | Interim Fix |
---|---|
7.3.1 | 32221a.230524.epkg.Z |
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 โopenssl dgst -sha256 [filename]โ command as the following:
openssl dgst -sha256 | filename |
---|---|
a5798a5eeb88b25541a9d73eb923d0b80b217e7c9aa7b2098c87d5f08d8f06f4 | 32221a.230524.epkg.Z |
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 at <http://ibm.com/support/> and describe the discrepancy.
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/security/curl_advisory.asc.sig>
B. FIX AND INTERIM FIX INSTALLATION
If possible, it is recommended that a mksysb backup of the system be created. Verify it is both bootable and readable before proceeding.
To preview a fix installation:
installp -a -d fix_name -p all # where fix_name is the name of the
To install a fix package:
installp -a -d fix_name -X all # where fix_name is the name of the
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.
Interim fix management documentation can be found at:
<http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html>
To preview an interim fix installation:
emgr -e ipkg_name -p # where ipkg_name is the name of the
To install an interim fix package:
emgr -e ipkg_name -X # where ipkg_name is the name of the
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