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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0593 IBM Security Bulletin: Vulnerability in tcpdump affects AIX (CVE-2018-19519) Security Bulletin 27 February 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM AIX Publisher: IBM Operating System: AIX Impact/Access: Denial of Service -- Remote/Unauthenticated Execute Arbitrary Code/Commands -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-19519 Reference: ESB-2018.3906 ESB-2018.3885 Original Bulletin: http://www.ibm.com/support/docview.wss?uid=ibm10873086 - --------------------------BEGIN INCLUDED TEXT-------------------- Vulnerability in tcpdump affects AIX (CVE-2018-19519) Product: AIX family Software version: 7.1, 7.2 Operating system(s): AIX Reference #: 0873086 Security Bulletin Summary There is a vulnerability in tcpdump that affects AIX. Vulnerability Details CVEID: CVE-2018-19519 DESCRIPTION: Tcpdump is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the print_prefix function of print-hncp.c. By using a specially-crafted packet data, a remote attacker could overflow a buffer and execute arbitrary code on the system or cause the application to crash. CVSS Base Score: 7.3 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/ 153314 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) Affected Products and Versions AIX 7.1, 7.2 VIOS 2.2.x The following fileset levels are vulnerable: key_fileset = aix Fileset Lower Level Upper Level KEY - --------------------------------------------------------- bos.net.tcp.server 6.1.9.0 6.1.9.400 key_w_fs bos.net.tcp.server 7.1.4.0 7.1.4.34 key_w_fs bos.net.tcp.server 7.1.5.0 7.1.5.31 key_w_fs bos.net.tcp.tcpdump 7.2.1.0 7.2.1.3 key_w_fs bos.net.tcp.tcpdump 7.2.2.0 7.2.2.16 key_w_fs bos.net.tcp.tcpdump 7.2.3.0 7.2.3.15 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 bos.net.tcp.server Remediation/Fixes A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY - ----------------------------------------------------- 7.1.4 IJ12979 ** SP08-1914 key_w_apar 7.1.5 IJ12980 ** SP04-1913 key_w_apar 7.2.1 IJ12981 ** SP06-1914 key_w_apar 7.2.2 IJ12982 ** SP04-1914 key_w_apar 7.2.3 IJ12983 ** SP03-1913 key_w_apar VIOS Level APAR Availability SP KEY - ---------------------------------------------------- 2.2.5 IJ12978 ** 2.2.5.60 key_w_apar 2.2.6 IJ12978 ** 2.2.6.40 key_w_apar 3.1.0 IJ12983 ** 3.1.0.20 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/docview.wssuid=isg1IJ12978 https://www.ibm.com/support/docview.wssuid=isg1IJ12979 https://www.ibm.com/support/docview.wssuid=isg1IJ12980 https://www.ibm.com/support/docview.wssuid=isg1IJ12981 https://www.ibm.com/support/docview.wssuid=isg1IJ12982 https://www.ibm.com/support/docview.wssuid=isg1IJ12983 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 fixes are available. The AIX fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/security/tcpdump_fix4.tar http://aix.software.ibm.com/aix/efixes/security/tcpdump_fix4.tar https://aix.software.ibm.com/aix/efixes/security/tcpdump_fix4.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 - ---------------------------------------------- 7.1.4.7 IJ12979m7a.190205.epkg.Z key_w_fix 7.1.5.3 IJ12980m3a.190212.epkg.Z key_w_fix 7.2.1.5 IJ12981m5a.190225.epkg.Z key_w_fix 7.2.2.3 IJ12982m3a.190215.epkg.Z key_w_fix 7.2.3.2 IJ12983m2a.190215.epkg.Z key_w_fix Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.2.3 is AIX 7200-02-03. Please reference the Affected Products and Version section above for help with checking installed fileset levels. VIOS Level Interim Fix (*.Z) KEY - ----------------------------------------------- 2.2.5.40 IJ12978s9a.190215.epkg.Z key_w_fix 2.2.5.50 IJ12978s9a.190215.epkg.Z key_w_fix 2.2.6.21 IJ12978sBa.190215.epkg.Z key_w_fix 2.2.6.23 IJ12978sBa.190215.epkg.Z key_w_fix 2.2.6.32 IJ12978sCa.190215.epkg.Z key_w_fix 3.1.0.10 IJ12983m2a.190215.epkg.Z key_w_fix To extract the fixes from the tar file: tar xvf tcpdump_fix4.tar cd tcpdump_fix4 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 - ----------------------------------------------------------------------------------------------------- 959cc124a81763c57bd1c9576f8c180a581f7685a9b6ee17e517f9863dc5f7c7 IJ12979m7a.190215.epkg.Z key_w_csum 2e05ddb65cb649d7c68342573823c7aca9febbf55ac4e4b761c6cc3429f9c472 IJ12978s9a.190215.epkg.Z key_w_csum 819ab2731f480d654db43159adf92176726edbc9377769e0215461713c933714 IJ12978sBa.190215.epkg.Z key_w_csum 216fc77d43f0713873ccb0cc7b5f531216245e4eefc02ca07b56b763ddf0c5da IJ12978sCa.190215.epkg.Z key_w_csum 0c0790166da0f92f198abfe50255a9282c458a8f3f8158b17660512e67de8003 IJ12980m3a.190212.epkg.Z key_w_csum cae215ce40cf9bd51f4fbbdee172258a1b24143cf1004e30b102416b359a4a87 IJ12981m5a.190225.epkg.Z key_w_csum 1a8bbeed0a375739b133c317099ab938a43f670a355fd76f16641a640c7039d3 IJ12982m3a.190215.epkg.Z key_w_csum b87249e90504d241f9359c66f16527e2cd73c1b50a05199d4968ad5a79f10af7 IJ12983m2a.190215.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/tcpdump_advisory4.asc.sig https://aix.software.ibm.com/aix/efixes/security/tcpdump_advisory4.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/tcpdump_advisory4.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. Reference Complete CVSS v3 Guide On-line Calculator v3 Related Information IBM Secure Engineering Web Portal IBM Product Security Incident Response Blog AIX Security Bulletin (ASCII format) Acknowledgement None. *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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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