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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.2788.2 Reference count overflow in mqueue filesystem 25 October 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: mqueuefs Publisher: FreeBSD Operating System: FreeBSD Impact/Access: Root Compromise -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2019-5603 Original Bulletin: https://security.freebsd.org/advisories/FreeBSD-SA-19:15.mqueuefs.asc https://www.freebsd.org/security/advisories/FreeBSD-SA-19:24.mqueuefs.asc Comment: This bulletin contains two (2) FreeBSD security advisories. Revision History: October 25 2019: Added FreeBSD-SA-19:24.mqueuefs July 26 2019: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-19:15.mqueuefs Security Advisory The FreeBSD Project Topic: Reference count overflow in mqueue filesystem Category: core Module: kernel Announced: 2019-07-24 Credits: Mateusz Guzik Affects: All supported versions of FreeBSD. Corrected: 2019-07-23 21:12:32 UTC (stable/12, 12.0-STABLE) 2019-07-24 12:55:16 UTC (releng/12.0, 12.0-RELEASE-p8) 2019-07-23 21:15:28 UTC (stable/11, 11.2-STABLE) 2019-07-24 12:55:16 UTC (releng/11.2, 11.2-RELEASE-p12) 2019-07-24 12:55:16 UTC (releng/11.3, 11.3-RELEASE-p1) CVE Name: CVE-2019-5603 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 mqueuefs(5) implements POSIX message queue file system which can be used by processes as a communication mechanism. 'struct file' represents open files, directories, sockets and other entities. II. Problem Description System calls operating on file descriptors obtain a reference to relevant struct file which due to a programming error was not always put back, which in turn could be used to overflow the counter of affected struct file. III. Impact A local user can use this flaw to obtain access to files, directories, sockets etc. opened by processes owned by other users. If obtained struct file represents a directory from outside of user's jail, it can be used to access files outside of the jail. If the user in question is a jailed root they can obtain root privileges on the host system. IV. Workaround No workaround is available. Note that the mqueuefs file system is not enabled by default. V. Solution Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. Perform one of the following: 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 # shutdown -r +10min "Security update" 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-19:15/mqueuefs.patch # fetch https://security.FreeBSD.org/patches/SA-19:15/mqueuefs.patch.asc # gpg --verify mqueuefs.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in <URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - - ------------------------------------------------------------------------- stable/12/ r350261 releng/12.0/ r350284 stable/11/ r350263 releng/11.2/ r350284 releng/11.3/ r350284 - - ------------------------------------------------------------------------- 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-2019-5603> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:15.mqueuefs.asc> - -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAl04WmdfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cIWpBAAg9BmPamkj7wLJODR8SvNk+qYqEbYeakiSGnvXllz2l+qI2dhMVsuQRGQ ko7VY0P2Wuh68UiiDG63Oq3hbOWPPkL1axk6n275rZSdoVj856tjrHjnUtP3UX5S WQUKRAREjhVjM9dAOwCYrmAmcpX4SkslklhfiR6AR62t4eptMlfJ6ACQATs6FPnX WRdyDe7yq0mL4UHWg+PvotQ+rxGiynwgVRMXwaglKOldGOuPOeuj7azM4nb6/qkN GjJlJOIRwfU1/sXVII3cCzndnCrz5A0sSttg4JK+uzneJNze+rOghGbyQ9F046z9 H0M0Ae6M74UCyioyoTrQgvivWvATtNRkLBoRfvHQUNGSt6bS9g1F0N5J7NCgaIPx vos7P4vnRM1avEAAnAhmm9eYAkO5VLmTb1ry5vOY1o2viesN3P0URcj7o+JIipaA Kqlff154N2nJmCkT0BJ3m+80GWeAnwqli/LvAIruXxc2hqgWLh7wO+71mraPrV5Z 2+IiuLPMF18FdpTBjhXyX5zCtW7t7uARgZLJMjM+hTXc7aAer7746XY5JyXfRsa9 jLVWHlff2YoF7DySyDIC7+ONfPIHGgr45imdJgJ9Cxu31ZBmCjesNR4x1DCKgLvT KnpBvofWIkIb8sEikEnXMfrHqoP/RtVtK73GlmT7sbH9PDQPUYw= =ehKK - -----END PGP SIGNATURE----- ============================================================================= - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-19:24.mqueuefs Security Advisory The FreeBSD Project Topic: Reference count overflow in mqueue filesystem 32-bit compat Category: core Module: kernel Announced: 2019-08-20 Credits: Karsten König, Secfault Security Affects: All supported versions of FreeBSD. Corrected: 2019-08-20 17:45:22 UTC (stable/12, 12.0-STABLE) 2019-08-20 17:51:32 UTC (releng/12.0, 12.0-RELEASE-p10) 2019-08-20 17:46:22 UTC (stable/11, 11.3-STABLE) 2019-08-20 17:51:32 UTC (releng/11.3, 11.3-RELEASE-p3) 2019-08-20 17:51:32 UTC (releng/11.2, 11.2-RELEASE-p14) CVE Name: CVE-2019-5603 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/>. Note: This issue is related to the previously disclosed SA-19:15.mqueuefs. It is another instance of the same bug and as such shares the same CVE. I. Background mqueuefs(5) implements POSIX message queue file system which can be used by processes as a communication mechanism. 'struct file' represents open files, directories, sockets and other entities. II. Problem Description System calls operating on file descriptors obtain a reference to relevant struct file which due to a programming error was not always put back, which in turn could be used to overflow the counter of affected struct file. III. Impact A local user can use this flaw to obtain access to files, directories, sockets, etc., opened by processes owned by other users. If obtained struct file represents a directory from outside of user's jail, it can be used to access files outside of the jail. If the user in question is a jailed root they can obtain root privileges on the host system. IV. Workaround No workaround is available. Note that the mqueuefs file system is not enabled by default. V. Solution Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date, and reboot. Perform one of the following: 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 # shutdown -r +10min "Security update" 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-19:24/mqueuefs.patch # fetch https://security.FreeBSD.org/patches/SA-19:24/mqueuefs.patch.asc # gpg --verify mqueuefs.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in <URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - - ------------------------------------------------------------------------- stable/12/ r351255 releng/12.0/ r351261 stable/11/ r351257 releng/11.3/ r351261 releng/11.2/ r351261 - - ------------------------------------------------------------------------- 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 <other info on vulnerability> <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5603> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:24.mqueuefs.asc> - -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAl1cPglfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cIKGA/+Oh+ORvFs273SJwaYaf8LCJ21IJnzVxDp9vS6MSO79LmI6HeiqAy9apQs Ec4zOXvE5MzYfA+E9jyRa6c4h7OY7uSSym15wCjLLi+DWPJ1lcCPAv01JuAgSw9E GkLOprdk2aETTe1jc3DjXv0q56JZM79vegL2Nn/AJd7GZqSI4Qxf0M+87eWFMxd6 dFlvZtnh4QGuSC8w+ls5LpcGHfr8T6w4WwNv6hfvxu//Bg/6BRYKEIAnAu/P+udd LrZO5lY9IwdaLQckk44nCr02lHVG/G3JgyW2iWAn5tm0CPkQmbawbc6V2WN+lwYf ynn0ORfKWZpeLN6hd1QedlBhyEblUdjveVy9vaJI2KieHdRMlb56/HsPQqwZLdgV QrpambGJ4J+48gYcgOXsOn52kIG7iKLfyEsiH4mrQtlZEjfluWt0cGcNuMLNqgPc WZC1Kqpx3OI00u2M+85xnM8V4VL7iQnX7WWoe8qICZDksAsm4LDTwOP4HdfXkCgs iSibovwF9ZcKwZjB8AZ+smjRyHGb2KEs+WlGI+ASE5UF8jYshCEZWKfJFd59BJZx uw/lngCium0OgQ0Bzt0NnqR663kzSE1f7ZGLJtoc5+xaWbnTbifykYsM88hO/+/v LH/fYRdgXkDTtShiMgppx/YrfTF33+hea18CdNdtdPJmH99lPmE= =1dwe - -----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 iQIVAwUBXbJTcWaOgq3Tt24GAQgEfQ/+OMttC/m7TFWCyrStwYGKMjmwJZIs7LqI xcutuKVkGR6s/IgxyUZxgql6FdA8xwgjWtlIBtftSdTNEp/LkzwVJKATWGwmwJ6w EO35Fk4QHrYb3r4QhPIfTgLP5fOkHqshvwmL5GGQDY9CtfJILSfaN7OGGd1zZcYo uunn3bn10pqnsepAZ5DQqDAX9TyLxEKTmxxQp9i8ZLsRZtXsDbWBNXDTSSwq4EI0 sMkkIqnrZW5ETZJttJbor7+96cLrsZbhphhzi8yPRnoPk8zhi7bsQ6Jrl+fkCivp NaHWWF+GtZOq4z1n81OSKpW0DFxmi+mMF55uHlOLldAxle0VNRAS0HjIR+msmDi+ U8eN3DB4bNij69iZaGk00nFk7v0YY2/Cko1xAqnlVN7Ytl+/tK92iyM3fHrvvGnQ iVeURGgDZRzmEWQFvucgW1zWdKheCOmlWT38e9snGAEn9M2V++jGsduIUasUDID9 oIKkSX0am2g7x627nwOOBkCBp/mQj2dVChTepNNhM+vVRAuogPYIkXuUoXJeoRXY xS2A48BROrW8CQYHj4bwkwv8t6sWQKDf9rTIk+1/boxvTSn7BUXGd/Z7usWScwS3 Ie02625ICzQAZNX5KFw2UKgidEZ8iCBHwVGQ9oHezf5Dr0V2yv5y8O51Yi0qMpzx +6+wwwm+CtM= =CODt -----END PGP SIGNATURE-----