IBM SECURITY ADVISORY
First Issued: Wed Dec 4 15:39:12 CST 2024
The most recent version of this document is available here:
https://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory16.asc
Security Bulletin: PowerSC is vulnerable to information disclosure, denial of
service, and security restrictions bypass due to Curl
===============================================================================
SUMMARY:
Vulnerabilities in Curl could allow a local attacker to obtain sensitive
information (CVE-2024-7264) or a remote attacker to cause a denial of
service (CVE-2024-6197, CVE-2024-37371) or bypass security restrictions
(CVE-2024-37370). PowerSC uses Curl as part of PowerSC Trusted Network
Connect (TNC).
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2024-7264
https://www.cve.org/CVERecord?id=CVE-2024-7264
DESCRIPTION: cURL libcurl could allow a local attacker to obtain
sensitive information, caused by an out-of-bounds read flaw in the
the GTime2str() function. By sending a specially crafted request, an
attacker could exploit this vulnerability to obtain sensitive
information or cause the application to crash.
CVSS Base score: 3.6
CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L)
CVEID: CVE-2024-6197
https://www.cve.org/CVERecord?id=CVE-2024-6197
DESCRIPTION: cURL libcurl is vulnerable to a denial of service, caused by
a memory allocation flaw in the utf8asn1str() function in the ASN1
parser. By using a specially crafted TLS certificate, a remote
attacker could exploit this vulnerability to cause a denial of
service condition.
CVSS Base score: 6.5
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
CVEID: CVE-2024-37371
https://www.cve.org/CVERecord?id=CVE-2024-37371
DESCRIPTION: MIT Kerberos 5 (aka krb5) is vulnerable to a denial of
service, caused by an invalid memory reads during GSS message token
handling. By sending specially crafted message tokens, a remote
authenticated attacker could exploit this vulnerability to cause a
denial of service condition.
CVSS Base score: 6.5
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2024-37370
https://www.cve.org/CVERecord?id=CVE-2024-37370
DESCRIPTION: MIT Kerberos 5 (aka krb5) could allow a remote attacker to
bypass security restrictions, caused by improper access control. By
sending a specially crafted request to modify the plaintext Extra
Count field of a confidential GSS krb5 wrap token, an attacker could
exploit this vulnerability to cause the unwrapped token to appear
truncated to the application.
CVSS Base score: 7.4
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H)
AFFECTED PRODUCTS AND VERSIONS:
PowerSC 1.3, 2.0, 2.1, 2.2
The vulnerabilities in the following filesets are being addressed:
key_fileset = powerscStd.tnc_pm
key_fileset = curl-8.9.1-1.aix7.1.ppc.rpm
Fileset Lower Level Upper Level KEY
---------------------------------------------------------------------
powerscStd.tnc_pm 1.3.0.4 2.2.0.3 key_w_fs
curl-8.9.1-1.aix7.1.ppc.rpm 7.19.4 8.7.1 key_w_fs
krb5-libs-1.21.3-1.aix7.1.ppc.rpm 1.18.0.0 1.21.2.1 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
Example: rpm -qa | grep krb5
REMEDIATION:
FIXES
IBM strongly recommends addressing the vulnerability now.
Fixes are available.
The fixes can be downloaded via yum:
To install any dependencies along with the fix package:
yum update curl
yum update krb5
WORKAROUNDS AND MITIGATIONS:
None.
===============================================================================
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Note: Keywords labeled as KEY in this document are used for parsing
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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: Wed Dec 4 15:39:12 CST 2024
===============================================================================
*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.