Security Bulletin: Multiple vulnerabilities in Curl affect PowerSC

Summary

There are multiple vulnerabilities in Curl that affect PowerSC.

Vulnerability Details

CVEID:CVE-2022-27776
**DESCRIPTION:**cURL libcurl could allow a remote attacker to obtain sensitive information, caused by a flaw when asked to send custom headers or cookies in its HTTP requests. By sending a specially-crafted request, an attacker could exploit this vulnerability to obtain authentication or cookie header data information, and use this information to launch further attacks against the affected system.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/225296 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)

CVEID:CVE-2022-27775
**DESCRIPTION:**cURL libcurl could allow a remote attacker to obtain sensitive information, caused by a logic error in the config matching function. By sending a specially-crafted request using IPv6, an attacker could exploit this vulnerability to cause libcurl to reuse the wrong connection to obtain sensitive information, and use this information to launch further attacks against the affected system.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/225295 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

CVEID:CVE-2022-27781
**DESCRIPTION:**cURL libcurl is vulnerable to a denial of service, caused by a flaw in the CURLOPT_CERTINFO option. By persuading a victim to visit a specially-crafted Web site, a remote attacker could exploit this vulnerability to cause a never ending busy-loop when trying to retrieve certificate chain information.
CVSS Base score: 6.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/226251 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)

CVEID:CVE-2022-27782
**DESCRIPTION:**cURL libcurl could allow a remote attacker to bypass security restrictions, caused by an easy connection reuse flaw for TLS and SSH. By sending a specially-crafted request using the connections in a connection pool, an attacker could exploit this vulnerability to bypass access restrictions.
CVSS Base score: 9.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/226252 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

CVEID:CVE-2022-27778
**DESCRIPTION:**An unspecified error with removing wrong file when --no-clobber is used together with --remove-on-error option in cURL libcurl has an unknown impact and attack vector.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/226248 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

CVEID:CVE-2022-27779
**DESCRIPTION:**cURL libcurl could allow a remote attacker to bypass security restrictions, caused by a flaw that wrongly allows HTTP cookies to be set for Top Level Domains (TLDs). By using a specially-crafted host name with a trailing dot, an attacker could exploit this vulnerability to allow arbitrary sites to set cookies that would get sent to a different and unrelated site or domain.
CVSS Base score: 9.1
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/226249 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N)

CVEID:CVE-2022-30115
**DESCRIPTION:**cURL libcurl could allow a remote attacker to obtain sensitive information, caused by a HSTS check bypass flaw. By sending a specially-crafted request using a host name in the an URL with a trailing dot, an attacker could exploit this vulnerability to obtain sensitive information over clear-text HTTP, and use this information to launch further attacks against the affected system.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/226253 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)

CVEID:CVE-2022-27780
**DESCRIPTION:**cURL libcurl could allow a remote attacker to bypass security restrictions, caused by a flaw that wrongly accepts percent-encoded URL separators like ‘/’ by the URL parser. By sending a specially-crafted host name in a URL, an attacker could exploit this vulnerability to bypass filters and checks for URL.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/226250 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

CVEID:CVE-2022-27774
**DESCRIPTION:**cURL libcurl could allow a remote attacker to obtain sensitive information, caused by a flaw in the “same host check” feature during a cross protocol redirects. By sending a specially-crafted request, an attacker could exploit this vulnerability to obtain credentials information, and use this information to launch further attacks against the affected system.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/225294 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)

CVEID:CVE-2022-22576
**DESCRIPTION:**cURL libcurl could allow a remote attacker to bypass security restrictions, caused by improper authentication validation when reuse OAUTH2-authenticated connections. By sending a specially-crafted request using user + “other OAUTH2 bearer”, an attacker could exploit this vulnerability to bypass access authentication validation.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/225291 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

Affected Products and Versions

The vulnerabilities in the following filesets are being addressed:

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

IBM strongly recommends addressing the vulnerability now.

Fixes are available.

The fixes can be downloaded via ftp or http from:

ftp://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix8.tar

<http://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix8.tar&gt;

<https://aix.software.ibm.com/aix/efixes/powersc/security/curl_fix8.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_fix8.tar

cd curl_fix8

Verify you have retrieved the fixes intact:

The checksums below were generated using the “openssl dgst -sha256 [filename]” command as the following:

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 -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:

<http://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory8.asc.sig&gt;

<https://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory8.asc.sig&gt;

ftp://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory8.asc.sig

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_fix8.tar

cd curl_fix8

To install a fix package:

rpm -ivh *.rpm

rpm -Uvh *.rpm

To install any dependencies along with the fix package:

yum update curl

Workarounds and Mitigations

None