CentOS ProjectPERL_ADVISORY5.ASCThere are vulnerabilities in Perl that affect AIX.
8.6 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.003 Low
EPSS
Percentile
70.4%
IBM SECURITY ADVISORY
First Issued: Wed Dec 9 16:36:39 CST 2020
|Updated: Thu Mar 4 08:59:07 CST 2021
|Update: iFixes now listed for AIX 7200-03-06, 7200-04-03, 7200-05-00, and
| 7200-05-01. iFixes now listed for VIOS 3.1.0.50, 3.1.1.30, 3.1.2.0, and
| 3.1.2.10.
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/perl_advisory5.asc
https://aix.software.ibm.com/aix/efixes/security/perl_advisory5.asc
ftp://aix.software.ibm.com/aix/efixes/security/perl_advisory5.asc
Security Bulletin: Vulnerabilities in Perl affect AIX (CVE-2020-10543,
CVE-2020-10878, and CVE-2020-12723)
===============================================================================
SUMMARY:
There are vulnerabilities in Perl that affect AIX.
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2020-10543
https://vulners.com/cve/CVE-2020-10543
https://vulners.com/cve/CVE-2020-10543
DESCRIPTION: Perl before 5.30.3 on 32-bit platforms allows a heap-based
buffer overflow because nested regular expression quantifiers have an
integer overflow.
CVSS Base Score: 9.8
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/183203
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2020-10878
https://vulners.com/cve/CVE-2020-10878
https://vulners.com/cve/CVE-2020-10878
DESCRIPTION: Perl before 5.30.3 has an integer overflow related to
mishandling of a "PL_regkind[OP(n)] == NOTHING" situation. A crafted
regular expression could lead to malformed bytecode with a
possibility of instruction injection.
CVSS Base Score: 9.8
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/183204
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2020-12723
https://vulners.com/cve/CVE-2020-12723
https://vulners.com/cve/CVE-2020-12723
DESCRIPTION: regcomp.c in Perl before 5.30.3 allows a buffer overflow
via a crafted regular expression because of recursive S_study_chunk
calls.
CVSS Base Score: 9.8
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/183205
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
AFFECTED PRODUCTS AND VERSIONS:
AIX 7.1, 7.2
VIOS 3.1
The following fileset levels are vulnerable:
key_fileset = aix
Fileset Lower Level Upper Level KEY
---------------------------------------------------------
perl.rte 5.20.1.0 5.20.1.3 key_w_fs
perl.rte 5.28.1.0 5.28.1.3 key_w_fs
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 perl.rte
REMEDIATION:
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR Availability SP KEY
-----------------------------------------------------
7.1.5 IJ26985 ** N/A key_w_apar
7.2.3 IJ26986 ** N/A key_w_apar
7.2.4 IJ26985 ** N/A key_w_apar
| 7.2.5 IJ26985 ** N/A key_w_apar
VIOS Level APAR Availability SP KEY
----------------------------------------------------
3.1.0 IJ26986 ** N/A key_w_apar
3.1.1 IJ26985 ** N/A key_w_apar
| 3.1.2 IJ26985 ** N/A key_w_apar
Subscribe to the APARs here:
http://www.ibm.com/support/pages/apar/IJ26985
http://www.ibm.com/support/pages/apar/IJ26986
https://www.ibm.com/support/pages/apar/IJ26985
https://www.ibm.com/support/pages/apar/IJ26986
By subscribing, you will receive periodic email alerting you
to the status of the APAR, and a link to download the fix once
it becomes available.
B. FIXES
AIX and VIOS fixes are available.
The AIX and VIOS fixes can be downloaded via ftp or http from:
ftp://aix.software.ibm.com/aix/efixes/security/perl_fix5.tar
http://aix.software.ibm.com/aix/efixes/security/perl_fix5.tar
https://aix.software.ibm.com/aix/efixes/security/perl_fix5.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.
AIX Level Interim Fix (*.Z) KEY
----------------------------------------------
7.1.5.5 IJ26985s1a.200812.epkg.Z key_w_fix
7.1.5.6 IJ26985s1a.200812.epkg.Z key_w_fix
7.1.5.7 IJ26985s1a.200812.epkg.Z key_w_fix
7.2.3.3 IJ26986s1a.200813.epkg.Z key_w_fix
7.2.3.4 IJ26986s1a.200813.epkg.Z key_w_fix
7.2.3.5 IJ26986s1a.200813.epkg.Z key_w_fix
| 7.2.3.6 IJ26986s1a.200813.epkg.Z key_w_fix
7.2.4.0 IJ26985s1a.200812.epkg.Z key_w_fix
7.2.4.1 IJ26985s1a.200812.epkg.Z key_w_fix
7.2.4.2 IJ26985s1a.200812.epkg.Z key_w_fix
| 7.2.4.3 IJ26985s1a.200812.epkg.Z key_w_fix
| 7.2.5.0 IJ26985s1a.200812.epkg.Z key_w_fix
| 7.2.5.1 IJ26985s1a.200812.epkg.Z key_w_fix
Please note that the above table refers to AIX TL/SP level as
opposed to fileset level, i.e., 7.2.3.5 is AIX 7200-03-05.
Please reference the Affected Products and Version section above
for help with checking installed fileset levels.
VIOS Level Interim Fix (*.Z) KEY
-----------------------------------------------
3.1.0.20 IJ26986s1a.200813.epkg.Z key_w_fix
3.1.0.21 IJ26986s1a.200813.epkg.Z key_w_fix
3.1.0.30 IJ26986s1a.200813.epkg.Z key_w_fix
3.1.0.40 IJ26986s1a.200813.epkg.Z key_w_fix
| 3.1.0.50 IJ26986s1a.200813.epkg.Z key_w_fix
3.1.1.0 IJ26985s1a.200812.epkg.Z key_w_fix
3.1.1.10 IJ26985s1a.200812.epkg.Z key_w_fix
3.1.1.20 IJ26985s1a.200812.epkg.Z key_w_fix
3.1.1.21 IJ26985s1a.200812.epkg.Z key_w_fix
3.1.1.22 IJ26985s1a.200812.epkg.Z key_w_fix
3.1.1.25 IJ26985s1a.200812.epkg.Z key_w_fix
| 3.1.1.30 IJ26985s1a.200812.epkg.Z key_w_fix
| 3.1.2.0 IJ26985s1a.200812.epkg.Z key_w_fix
| 3.1.2.10 IJ26985s1a.200812.epkg.Z key_w_fix
To extract the fixes from the tar file:
tar xvf perl_fix5.tar
cd perl_fix5
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
-----------------------------------------------------------------------------------------------------
389f7f4c299a6236394da168b2c2d6316db2fdc36a1c8ddc69aa3b3053ca2526 IJ26985s1a.200812.epkg.Z key_w_csum
e45b0ed34077f3432d5fca86d23a94b79ed34bf544e45ec4ccf83e7d6d0a4b14 IJ26986s1a.200813.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 -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/security/perl_advisory5.asc.sig
https://aix.software.ibm.com/aix/efixes/security/perl_advisory5.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/perl_advisory5.asc.sig
C. 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:
http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html
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.
If you would like to receive AIX Security Advisories via email,
please visit "My Notifications":
http://www.ibm.com/support/mynotifications
To view previously issued advisories, please visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq
Contact IBM Support for questions related to this announcement:
http://ibm.com/support/
https://ibm.com/support/
To obtain the OpenSSL public key that can be used to verify the
signed advisories and ifixes:
Download the key from our web page:
ftp://ftp.software.ibm.com/systems/power/AIX/systems_p_os_aix_security_pubkey.txt
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: Vulnerabilities in Perl affect AIX
https://www.ibm.com/support/pages/node/6380428
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Wed Dec 9 16:36:39 CST 2020
| Updated: Thu Mar 4 08:59:07 CST 2021
| Update: iFixes now listed for AIX 7200-03-06, 7200-04-03, 7200-05-00, and
| 7200-05-01. iFixes now listed for VIOS 3.1.0.50, 3.1.1.30, 3.1.2.0,
| and 3.1.2.10.
===============================================================================
*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.
Related
8.6 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.003 Low
EPSS
Percentile
70.4%