Security Bulletin: Vulnerabilities in Curl affect PowerSC (CVE-2020-8169, CVE-2020-8177)

Summary

There are vulnerabilities in Curl that affect PowerSC.

Vulnerability Details

CVEID:CVE-2020-8169
**DESCRIPTION:**cURL libcurl could allow a remote attacker to obtain sensitive information, caused by the failure to correctly URL encode the credential data when set using an curl_easy_setopt option. The host name and partial password is leaked in cleartext over DNS on HTTP redirect. An attacker could exploit this vulnerability to obtain sensitive information.
CVSS Base score: 5.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/183930 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)

CVEID:CVE-2020-8177
**DESCRIPTION:**cURL could allow a remote attacker to overwrite arbitrary files on the system, caused by the improper handling of certain parameters when using -J (–remote-header-name) and -I (–include) in the same command line. An attacker could exploit this vulnerability to overwrite a local file.
CVSS Base score: 5.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/183931 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)

Affected Products and Versions

Affected Product(s)	Version(s)
PowerSC	1.2
PowerSC	1.3

The vulnerabilities in the following filesets are being addressed:

Fileset	Lower Level	Upper Level

powerscStd.tnc_pm

| 1.2.0.3| 1.3.0.3

curl-7.71.1-1.aix6.1.ppc.rpm

| 7.19.4| 7.67.0

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

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_fix3.tar&gt;

<http://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix3.tar&gt;

<https://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix3.tar&gt;

The link above is to 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_fix3.tar

cd curl_fix3

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
—|—

6a7827faa2b0a247836d2b45943e7c876998f12114d2cc4320f568236a79987b

|

ca-certificates-2020.06.01-1.aix6.1.ppc.rpm

42ac6e7c33d4363e4c9ae92034e10840f5fdfdf84a286e4ab5ecac7ccce248a0

|

curl-7.71.1-1.aix6.1.ppc.rpm

1949d8fa59f30465473bcb5053ea96b242393e0c7175eeb91d588676600ea5ff

|

cyrus-sasl-2.1.26-3.aix6.1.ppc.rpm

2a85b8024e1aaff3f15962ac2fce4531b48500ce0bc3a8af3ada53ee0ec5706b

|

krb5-libs-1.16.1-4.aix6.1.ppc.rpm

655c09fa903f6adea25447c9d7df3e7e85f36d42d433538c66e381f34aa55913

|

libgcc-8.3.0-2.aix7.2.ppc.rpm

c93fe122f2cde9e33110be0f36b24596a64222cd45457b106f2791a3f7aab672

|

libnghttp2-1.41.0-1.aix6.1.ppc.rpm

22a9a3b7b4cbdc37f1e20afba3f0f09e0f6030644ae387bc6bc7e639ba07180f

|

libssh2-1.9.0-1.aix6.1.ppc.rpm

98ece9b9ad9e4a3e78ec153725915aa17a6876bf5b0b42bdfd33ad1de55a63e4

|

openldap-2.4.50-1.aix6.1.ppc.rpm

05061bbe92afc0833b91986280f6c389a04f626db8a61d4497528833df79b511

|

openssl-1.0.2.2100.tar.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.

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_advisory3.asc.sig&gt;

<https://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory3.asc.sig&gt;

ftp://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory3.a…

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_fix3.tar

cd curl_fix3

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