IBM SECURITY ADVISORY
First Issued: Wed Jun 4 08:15:59 CDT 2025
The most recent version of this document is available here:
https://aix.software.ibm.com/aix/efixes/security/curl_advisory7.asc
Security Bulletin: AIX is vulnerable to sensitive information disclosure
(CVE-2025-0167, CVE-2024-11053) and a denial of service (CVE-2024-9681)
due to cURL libcurl
===============================================================================
SUMMARY:
Vulnerabilities in cURL libcurl could allow a remote attacker to obtain
sensitive information (CVE-2025-0167, CVE-2024-11053) or cause a denial
of service (CVE-2024-9681). AIX uses cURL libcurl as part of rsyslog,
LV/PV encryption integration with HPCS and in Live Update for interacting
with HMC.
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2025-0167
https://www.cve.org/CVERecord?id=CVE-2025-0167
DESCRIPTION: When asked to use a `.netrc` file for credentials **and** to
follow HTTP redirects, curl could leak the password used for the first
host to the followed-to host under certain circumstances. This flaw
only manifests itself if the netrc file has a `default` entry that
omits both login and password. A rare circumstance.
CVSS Base Score: 3.4
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N)
CVEID: CVE-2024-11053
https://www.cve.org/CVERecord?id=CVE-2024-11053
DESCRIPTION: When asked to both use a `.netrc` file for credentials and
to follow HTTP redirects, curl could leak the password used for the
first host to the followed-to host under certain circumstances. This
flaw only manifests itself if the netrc file has an entry that
matches the redirect target hostname but the entry either omits just
the password or omits both login and password.
CVSS Base Score: 3.4
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N)
CVEID: CVE-2024-9681
https://www.cve.org/CVERecord?id=CVE-2024-9681
DESCRIPTION: When curl is asked to use HSTS, the expiry time for a
subdomain might overwrite a parent domain's cache entry, making it
end sooner or later than otherwise intended. This affects curl using
applications that enable HSTS and use URLs with the insecure `HTTP://`
scheme and perform transfers with hosts like `x.example.com` as well
as `example.com` where the first host is a subdomain of the second
host. The result of a triggered bug is that HTTP accesses to
`example.com` get converted to HTTPS for a different period of time
than what was asked for by the origin server. If `example.com` for
example stops supporting HTTPS at its expiry time, curl might then
fail to access `http://example.com` until the (wrongly set) timeout
expires. This bug can also expire the parent's entry *earlier*, thus
making curl inadvertently switch back to insecure HTTP earlier than
otherwise intended.
CVSS Base Score: 3.7
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N)
AFFECTED PRODUCTS AND VERSIONS:
AIX 7.3 TL1, 7.3 TL2, 7.3 TL3
The following fileset levels are vulnerable:
key_fileset = aix
Fileset Lower Level Upper Level KEY
---------------------------------------------------------
oss.lib.libcurl 7.79.1.0 7.79.1.0 key_w_fs
oss.lib.libcurl 8.1.2.0 8.1.2.0 key_w_fs
oss.lib.libcurl 8.5.0.0 8.5.0.1 key_w_fs
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
REMEDIATION:
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_fix7.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.
Note that the tar file contains Interim fixes that are based on
Curl version, and AIX Curl fixes are cumulative.
AIX Level Interim Fix (*.Z) KEY
-----------------------------------------------------------
7.3.1, 7.3.2, 7.3.3 11053sa.250506.epkg.Z key_w_fix
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_fix7.tar
cd curl_fix7
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
-----------------------------------------------------------------------------------------------------
618f674794b9012b69a7e491c877c5926656e976cc9c290cf13a5b625ba74aee 11053sa.250506.epkg.Z 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 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_advisory7.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
# fix package being previewed.
To install a fix package:
installp -a -d fix_name -X all # where fix_name is the name of the
# fix package being installed.
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
# interim fix package being previewed.
To install an interim fix package:
emgr -e ipkg_name -X # where ipkg_name is the name of the
# interim fix package being installed.
WORKAROUNDS AND MITIGATIONS:
None.
===============================================================================
CONTACT US:
Note: Keywords labeled as KEY in this document are used for parsing
purposes.
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please visit "My Notifications":
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Contact IBM Support for questions related to this announcement:
https://ibm.com/support/
For information on how to securely verify AIX security bulletins and fixes:
https://www.ibm.com/support/pages/node/6985269
To obtain the OpenSSL public key that can be used to verify the
signed advisories and ifixes:
Download the key from our web page:
https://aix.software.ibm.com/aix/efixes/security/systems_p_os_aix_security_pubkey.txt
To verify the AIX/VIOS security bulletin:
Published advisory OpenSSL signature file location:
https://aix.software.ibm.com/aix/efixes/security/curl_advisory7.asc.sig
openssl dgst -sha256 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file]
Please contact your local IBM AIX support center for any
assistance.
REFERENCES:
Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide
On-line Calculator v3:
http://www.first.org/cvss/calculator/3.0
RELATED INFORMATION:
IBM Secure Engineering Web Portal
http://www.ibm.com/security/secure-engineering/bulletins.html
IBM Product Security Incident Response Blog
https://www.ibm.com/blogs/psirt/
Security Bulletin: AIX is vulnerable to sensitive information disclosure
(CVE-2025-0167, CVE-2024-11053) and a denial of service (CVE-2024-9681)
due to cURL libcurl
https://www.ibm.com/support/pages/node/7235621
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Wed Jun 4 08:15:59 CDT 2025
===============================================================================
*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.