CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
AI Score
Confidence
High
Vulnerability in cURL libcurl could allow a remote attacker to bypass security restrictions (CVE-2024-0853). AIX uses cURL libcurl as part of rsyslog, LV/PV encryption integration with HPCS and in Live Update for interacting with HMC.
CVEID:CVE-2024-0853
**DESCRIPTION:**cURL libcurl could allow a remote authenticated attacker to bypass security restrictions, caused by a flaw with keeping the SSL session ID for connections in its cache even when the verify status (OCSP stapling) test failed. By sending a specially crafted request, an attacker could exploit this vulnerability to bypass OCSP verification.
CVSS Base score: 3.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/281082 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N)
Affected Product(s) | Version(s) |
---|---|
AIX | 7.3 TL1 SP4 |
AIX | 7.3 TL2 SP2 |
The following fileset levels are vulnerable:
Fileset | Lower Level | Upper Level |
---|---|---|
oss.lib.libcurl | 8.5.0.0 | 8.5.0.0 |
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 user’s guide.
Example: lslpp -L | grep -i oss.lib.libcurl
A. FIXES
IBM strongly recommends addressing the vulnerability now.
AIX fixes are available.
The AIX fixes can be downloaded via https from:
<https://aix.software.ibm.com/aix/efixes/security/curl_fix5.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 |
---|---|
7.3.1.4, 7.3.2.2 | 853sa.240503.epkg.Z |
Please reference the Affected Products and Version section above for help with checking installed fileset levels.
To extract the fixes from the tar file:
tar xvf curl_fix5.tar
cd curl_fix5
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 |
---|---|
77bc027152c49e7c572858fc7ada4183f2a556ef846ee0e26fc9e47ba4c9aaa4 | 853sa.240503.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_advisory5.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:
<https://www.ibm.com/support/pages/managing-interim-fixes-aix>
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
None
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
AI Score
Confidence
High