Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.2551 OpenSMTPD 5.7.2 released 6 October 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: OpenSMTPD Publisher: OpenBSD Operating System: BSD variants OS X Linux variants Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Modify Arbitrary Files -- Existing Account Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade Original Bulletin: https://www.opensmtpd.org/announces/release-5.7.2.txt Comment: This advisory references vulnerabilities in products which run on platforms other than OpenBSD. It is recommended that administrators running OpenSMTPD check for an updated version of the software for their operating system. - --------------------------BEGIN INCLUDED TEXT-------------------- Subject: Announce: OpenSMTPD 5.7.2 released OpenSMTPD 5.7.2 has just been released. OpenSMTPD is a FREE implementation of the SMTP protocol with some common extensions. It allows ordinary machines to exchange e-mails with systems speaking the SMTP protocol. It implements a fairly large part of RFC5321 and can already cover a large range of use-cases. It runs on OpenBSD, NetBSD, FreeBSD, DragonFlyBSD, OSX and Linux. The archives are now available from the main site at www.OpenSMTPD.org We would like to thank the OpenSMTPD community for their help in testing the snapshots, reporting bugs, contributing code and packaging for other systems. This is a minor release with security and reliability fixes only. You are encouraged to update as soon as possible. The following issues, among others less critical, were discovered during a code audit performed by Qualys Security [https://www.qualys.com]. This has been a very impressive and valuable contribution to our project, and we'd like to thank them again for this ;-) Issues fixed in this release (since 5.7.1): =========================================== - - an oversight in the portable version of fgetln() that allows attackers to read and write out-of-bounds memory; - - multiple denial-of-service vulnerabilities that allow local users to kill or hang OpenSMTPD; - - a stack-based buffer overflow that allows local users to crash OpenSMTPD, or execute arbitrary code as the non-chrooted _smtpd user; - - a hardlink attack (or race-conditioned symlink attack) that allows local users to unset the chflags() of arbitrary files; - - a hardlink attack that allows local users to read the first line of arbitrary files (for example, root's hash from /etc/master.passwd); - - a denial-of-service vulnerability that allows remote attackers to fill OpenSMTPD's queue or mailbox hard-disk partition; - - an out-of-bounds memory read that allows remote attackers to crash OpenSMTPD, or leak information and defeat the ASLR protection; - - a use-after-free vulnerability that allows remote attackers to crash OpenSMTPD, or execute arbitrary code as the non-chrooted _smtpd user; Checksums: ========== SHA256 (opensmtpd-5.7.2.tar.gz) = e77bc57a4727233f4d725d06ccec4f89bca69fe6adabca6ee8f5683f8ac453fb SHA256 (opensmtpd-5.7.2p1.tar.gz) = daae044488d456b33aa9c84ebcc79aef2f9ab2d17ebe0c0f09e41e1f4b60d992 Verify: ======= Starting with version 5.7.1, releases are signed with signify(1). You can obtain the public key from our website, check with our community that it has not been altered on its way to your machine. Once you are confident the key is correct, you can verify the release as described below: 1- get the signature file corresponding to the tarball you're installing $ wget https://www.opensmtpd.org/archives/opensmtpd-5.7.2.sum.sig 2- check that the tarball matches the checksum: $ sha256 opensmtpd-5.7.2.tar.gz SHA256 (opensmtpd-5.7.2.tar.gz) = e77bc57a4727233f4d725d06ccec4f89bca69fe6adabca6ee8f5683f8ac453fb $ cat opensmtpd-5.7.2.sum.sig |tail -1 e77bc57a4727233f4d725d06ccec4f89bca69fe6adabca6ee8f5683f8ac453fb 3- verify that the signature file was not forged: $ signify -V -e -p opensmtpd.pub -m opensmtpd-5.7.2.sum Signature Verified Support: ======== You are encouraged to register to our general purpose mailing-list: http://www.opensmtpd.org/list.html The "Official" IRC channel for the project is at: #OpenSMTPD @ irc.freenode.net Reporting Bugs: =============== Please read http://www.opensmtpd.org/report.html Security bugs should be reported directly to security@opensmtpd.org Other bugs may be reported to bugs@opensmtpd.org OpenSMTPD is brought to you by Gilles Chehade, Eric Faurot and Sunil Nimmagadda. - --------------------------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. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. 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: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== 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 iQIVAwUBVhNcG36ZAP0PgtI9AQLbiw//V21MTSQ3PSCWAT2LLamKpd7/4eSGbped aOsqQkt2IfHhVsXiOxv9uVdCo86VKoZQ04X3ir53UDsGE8rjYFX3p8LsGSyxM6QJ yPCEGqGZzai/B+KtaXB2QDjeRZ+JCusJDz7Cka0vEDWqNJcGEZlkRYiT3IwDnwhG Z1VwcP/p0+LjlrqHVmkuE2OrpxfzOZhfaWjW6tp1JyONlcWb2aU7pGLKKVohB/sB FMDeaoVrxDVQag88GRjNc2itRvmYIgfqU1aunqZ4/0+eSLfR8+56Br3+uLQxFxkS pq3ZYd11H3M0XrjHtKXB1cEvumZIRsoq4/yMex426PLi4hgYo1Z2bfWxaaTCtSmV 4C9sWTt2bA2u5mf+dGzf2l8dGjHY7TxIeIfOhdf/rJ/Nc/5JyYrkHrETuZWSqQNI gpzAosiWiKoIy/LWT/TUxTZhOavGKTbhdlhHqneZNFYt4AyZmAsnfsVZwigokp7i TOIaBg4yRWF6moxu4NOmhfCCQlstl2zoeCygcrOQDleTwYZTp3X1xvrYY9DmAkwD K7mjx+kxbg9UXmtr1sRTo6AvgeCyEElpVOR2UARBoITqRZ7uCUoGWEESR2kfoOzf 0URRpOwVxtgnDTgBaMxUuZaEwCjR9pNOMPmsffCqUTSFH1h4gg/sISpu1MbHR+v4 Nt6/wwBcAR8= =UgS9 -----END PGP SIGNATURE-----