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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.3031.2 Insufficient message length validation in bsnmp library 25 October 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: bsnmp Publisher: FreeBSD Operating System: FreeBSD Impact/Access: Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-5610 Original Bulletin: https://security.freebsd.org/advisories/FreeBSD-SA-19:20.bsnmp.asc Comment: This bulletin contains two (2) FreeBSD security advisories. Revision History: October 25 2019: Vendor updated FreeBSD-SA-19:20 August 9 2019: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-19:20.bsnmp Security Advisory The FreeBSD Project Topic: Insufficient message length validation in bsnmp library Category: contrib Module: bsnmp Announced: 2019-08-06 Credits: Guido Vranken <guidovranken@gmail.com> Affects: All supported versions of FreeBSD. Corrected: 2019-08-06 16:11:16 UTC (stable/12, 12.0-STABLE) 2019-08-06 17:12:17 UTC (releng/12.0, 12.0-RELEASE-p9) 2019-08-06 16:12:43 UTC (stable/11, 11.3-STABLE) 2019-08-06 17:12:17 UTC (releng/11.3, 11.3-RELEASE-p2) 2019-08-06 17:12:17 UTC (releng/11.2, 11.2-RELEASE-p13) CVE Name: CVE-2019-5610 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>. I. Background The bsnmp software library is used for the Internet SNMP (Simple Network Management Protocol). As part of this it includes functions to handle ASN.1 (Abstract Syntax Notation One). II. Problem Description A function extracting the length from type-length-value encoding is not properly validating the submitted length. III. Impact A remote user could cause, for example, an out-of-bounds read, decoding of unrelated data, or trigger a crash of the software such as bsnmpd resulting in a denial of service. IV. Workaround No workaround is available. V. Solution Perform one of the following: Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. 1) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install 2) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch https://security.FreeBSD.org/patches/SA-19:20/bsnmp.patch # fetch https://security.FreeBSD.org/patches/SA-19:20/bsnmp.patch.asc # gpg --verify bsnmp.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile the operating system using buildworld and installworld as described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>. Restart all daemons that use the library, or reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - - ------------------------------------------------------------------------- stable/12/ r350637 releng/12.0/ r350646 stable/11/ r350638 releng/11.3/ r350646 releng/11.2/ r350646 - - ------------------------------------------------------------------------- To see which files were modified by a particular revision, run the following command, replacing NNNNNN with the revision number, on a machine with Subversion installed: # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NNNNNN with the revision number: <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN> VII. References <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5610> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:20.bsnmp.asc> - -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAl1Jt1lfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cKtBBAAltxFzxuMqWCgJoL9SemLRQxGGk0hRFdN5b78mgVdk2lfDgVz8U7mVM6v XbcCa4lIy7wMYpUdEySAZLR2ENt0xdpx7oQ6lAg5fnnvrUvom4wU9ruxEs5txFVL K6RaJnQJyOkI2c/LYvI/ZYmuc29/Nt3p/DvVe7wq86taoqUufN11MXkrRHgn68N3 7vewixzWpqH5L/aY2qP1d+Xe3QmHX0IcFqeo4U3/3G4wUGRCfHtaENY4w5eUbCa2 1Qk0oS9iUdX1IJjM5l1ccoFqsjbcO6vNS337qeYNKhLspXMQPwoS0K0HfB6LKt1D dCBFoXu/qUFjf3qqbpcqGEFrFPZjlNmC4R0Ngx1rfZ1t1dXbj83NOOE1okd3Gb/V TPDU/jzwt+/6DE6ryNQpeanPdim83w/j+qeA0UaTyxlbj+oSz1gU9Ckaauf+9peI GT8TPnrgmFlYg2tkYl4tbq5LtRstPGZYguqEt5SHCxBOg3dxByMPzikSFUL9oNxS 9GX7JZT36J20f62hG8Watp2y3W0QsMjJpxF9OojRU6B15Z4Q2aCht4F6DnvEkVfN 1GvS5NAHPHU09TniSgYK3ThkoYrLYykhsXPmJmETV7DU1Qhny1p8H0NwIwB20DEm AOAcYzLhiXHGpniE5y+MT9Pvt3BDBt36k6WgZ4eZ4RWuzGOumiU= =rH6X - -----END PGP SIGNATURE----- ============================================================================== - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-19:20.bsnmp Security Advisory The FreeBSD Project Topic: Insufficient message length validation in bsnmp library Category: contrib Module: bsnmp Announced: 2019-08-06 Credits: Guido Vranken <guidovranken@gmail.com> Affects: All supported versions of FreeBSD. Corrected: 2019-08-06 16:11:16 UTC (stable/12, 12.0-STABLE) 2019-08-06 17:12:17 UTC (releng/12.0, 12.0-RELEASE-p9) 2019-08-06 16:12:43 UTC (stable/11, 11.3-STABLE) 2019-08-06 17:12:17 UTC (releng/11.3, 11.3-RELEASE-p2) 2019-08-06 17:12:17 UTC (releng/11.2, 11.2-RELEASE-p13) CVE Name: CVE-2019-5610 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>. I. Background The bsnmp software library is used for the Internet SNMP (Simple Network Management Protocol). As part of this it includes functions to handle ASN.1 (Abstract Syntax Notation One). II. Problem Description A function extracting the length from type-length-value encoding is not properly validating the submitted length. III. Impact A remote user could cause, for example, an out-of-bounds read, decoding of unrelated data, or trigger a crash of the software such as bsnmpd resulting in a denial of service. IV. Workaround No workaround is available. V. Solution Perform one of the following: Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. 1) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install 2) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch https://security.FreeBSD.org/patches/SA-19:20/bsnmp.patch # fetch https://security.FreeBSD.org/patches/SA-19:20/bsnmp.patch.asc # gpg --verify bsnmp.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile the operating system using buildworld and installworld as described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>. Restart all daemons that use the library, or reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - - ------------------------------------------------------------------------- stable/12/ r350637 releng/12.0/ r350646 stable/11/ r350638 releng/11.3/ r350646 releng/11.2/ r350646 - - ------------------------------------------------------------------------- To see which files were modified by a particular revision, run the following command, replacing NNNNNN with the revision number, on a machine with Subversion installed: # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NNNNNN with the revision number: <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN> VII. References <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5610> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:20.bsnmp.asc> - -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAl1Jt1lfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cKtBBAAltxFzxuMqWCgJoL9SemLRQxGGk0hRFdN5b78mgVdk2lfDgVz8U7mVM6v XbcCa4lIy7wMYpUdEySAZLR2ENt0xdpx7oQ6lAg5fnnvrUvom4wU9ruxEs5txFVL K6RaJnQJyOkI2c/LYvI/ZYmuc29/Nt3p/DvVe7wq86taoqUufN11MXkrRHgn68N3 7vewixzWpqH5L/aY2qP1d+Xe3QmHX0IcFqeo4U3/3G4wUGRCfHtaENY4w5eUbCa2 1Qk0oS9iUdX1IJjM5l1ccoFqsjbcO6vNS337qeYNKhLspXMQPwoS0K0HfB6LKt1D dCBFoXu/qUFjf3qqbpcqGEFrFPZjlNmC4R0Ngx1rfZ1t1dXbj83NOOE1okd3Gb/V TPDU/jzwt+/6DE6ryNQpeanPdim83w/j+qeA0UaTyxlbj+oSz1gU9Ckaauf+9peI GT8TPnrgmFlYg2tkYl4tbq5LtRstPGZYguqEt5SHCxBOg3dxByMPzikSFUL9oNxS 9GX7JZT36J20f62hG8Watp2y3W0QsMjJpxF9OojRU6B15Z4Q2aCht4F6DnvEkVfN 1GvS5NAHPHU09TniSgYK3ThkoYrLYykhsXPmJmETV7DU1Qhny1p8H0NwIwB20DEm AOAcYzLhiXHGpniE5y+MT9Pvt3BDBt36k6WgZ4eZ4RWuzGOumiU= =rH6X - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXbJQi2aOgq3Tt24GAQiqOBAAk6+bVCsR6jTiiXX+AkjEgH1oWhuTm+SC hnYMMO4aruIcrExGWJlrf72ZpC9MFIpDob46o9KUWOrI+VjwFlVaHRoObF5cEdDg htbSUE/ZBzTmCskcR2j10wNAlniifROZTvCVdMf6ASs0q9eayFjDBukz7sawrSS2 HfKTb0DBTqIK/C09wnGmUo6KEpvKwgZ4mAFP7E8jgxmaXpv9aOojBl0G8gYiU5lv zY3v5znKXPSMT48AavdZTyvMBBbaUAE2BedA/K+pjrHq2+ajCJQRUPCYhPC6OsJQ GbrvPxFaxjTs3x0uxBehgbtt9pQm99aLomYN4G754Dh9/2bNDzG+pubZ61t9zos8 YxmzMic1VyhwSk7OH6xFzKwZy/xhcDMQ2CSBvFal+kvlBxktXWSJfTOszJWmA+5K +XOtLGeziKwiJBUnn5jgG7iZ4rfOYhndtAzQGwkadQBLfA/mN5kaOPs8ydm015Md JjkyqlitOmsskDzGWbubh5yoyZLxwO2LfDfdtYtp9YUvkWZSUaMSE1cSM3cKrZZ/ QYtJSSo5WIyrbgsEMG50mCDoFDvEHcQHBx8eMv9HWVjhLm1tqzOMPq5kd+xr3pSi jwgoIklRzgs/7NkXWtHHsr/co1L5cJMuOqgmbeRZH83CNe9QmAeopG0+1OnDs+hF OcJ8tn29xiA= =m/Bw -----END PGP SIGNATURE-----