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AUSCERT External Security Bulletin Redistribution
ESB-2019.4780
Security Bulletin: Vulnerabilities in Curl affect PowerSC
(CVE-2019-5435, CVE-2019-5436)
23 December 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: IBM PowerSC Express Edition
Publisher: IBM
Operating System: AIX
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-5436 CVE-2019-5435
Reference: ESB-2019.2839
ESB-2019.2392
ESB-2019.1917
Original Bulletin:
https://www.ibm.com/support/pages/node/1108041
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Security Bulletin: Vulnerabilities in Curl affect PowerSC (CVE-2019-5435,
CVE-2019-5436)
Document Information
Product : PowerSC Express Edition
Component : PowerSC
Software version : 1.2
Operating system(s): AIX
Edition : All
Summary
There are vulnerabilities in Curl that affect PowerSC.
Vulnerability Details
CVEID: CVE-2019-5435
DESCRIPTION: An integer overflow in curl's URL API results in a buffer
overflow in libcurl 7.62.0 to and including 7.64.1.
CVSS Base score: 7.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities
/161429 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
CVEID: CVE-2019-5436
DESCRIPTION: A heap buffer overflow in the TFTP receiving code allows for DoS
or arbitrary code execution in libcurl versions 7.19.4 through 7.64.1.
CVSS Base score: 6.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities
/161431 for the current score.
CVSS Vector: (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
Affected Products and Versions
+-------------------+----------+
|Affected Product(s)|Version(s)|
+-------------------+----------+
|PowerSC |1.2 |
+-------------------+----------+
The following fileset levels are vulnerable:
Fileset Lower Level Upper Level
powerscStd.tnc_pm 1.2.0.0 1.2.0.3
curl-7.65.1-1.aix6.1.ppc.rpm 7.19.4 7.64.1
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.
Example: rpm -qa | grep curl
Remediation/Fixes
A. FIXES
Fixes are available.
The fixes can be downloaded via ftp or http from:
ftp://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix.tar
http://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix.tar
https://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix.tar
The link above is 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_fix.tar
cd curl_fix
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
- -----------------------------------------------------------------------------------------------------------------------
56e394405836f1bdf7d188cef30adf5f6151fe594b39576dfbd953435e192569
ca-certificates-2016.10.7-2.aix6.1.ppc.rpm key_w_csum
5f01da544ae221c3f98ecd864782597b326f7838bb759cbb44b8366cad2eaeee
curl-7.65.1-1.aix6.1.ppc.rpm key_w_csum
3ef01f3aea3e62ce402158ea892dfdb101d2c2f1c06256c6a245dc3126610bc0
db-6.2.32-2.aix6.1.ppc.rpm key_w_csum
7d1b39e1b8ab29a33edf9bb8fb589e071a6e0e06b69182f8a08776f497715f49
krb5-libs-1.16.1-2.aix6.1.ppc.rpm key_w_csum
dfd52c9b162b075abdaea908910ade3ee13d923e36a7e45cf6e1308ef5e62b52
libgcc-8.1.0-2.aix7.2.ppc.rpm 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.
openssl dgst -sha1 -verify <pubkey_file> -signature <advisory_file>.sig
<advisory_file>
openssl dgst -sha1 -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_advisory.asc.sig
https://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory.asc.sig
ftp://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory.as...
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_fix.tar
cd curl_fix
To install a fix package:
rpm -ivh *.rpm
rpm -Uvh *.rpm
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.
Workarounds and Mitigations
None.
Change History
11 Nov 2019: 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.
Document Location
Worldwide
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