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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0649 [DLA 1701-1] openssl security update 4 March 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: openssl Publisher: Debian Operating System: Debian GNU/Linux 8 Impact/Access: Access Privileged Data -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2019-1559 Reference: ESB-2019.0630 ESB-2019.0620 Original Bulletin: https://lists.debian.org/debian-lts-announce/2019/03/msg00003.html - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Package : openssl Version : 1.0.1t-1+deb8u11 CVE ID : CVE-2019-1559 Juraj Somorovsky, Robert Merget and Nimrod Aviram discovered a padding oracle attack in OpenSSL. If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). AEAD ciphersuites are not impacted. For Debian 8 "Jessie", this problem has been fixed in version 1.0.1t-1+deb8u11. We recommend that you upgrade your openssl packages. Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS - -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEErPPQiO8y7e9qGoNf2a0UuVE7UeQFAlx5uElfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEFD RjNEMDg4RUYzMkVERUY2QTFBODM1RkQ5QUQxNEI5NTEzQjUxRTQACgkQ2a0UuVE7 UeR/BA/+Il0to7XRdFjAvxJG6cwzvemVHiLnKscdq5hr78hGb9qwxDpDQ51in+5o Vfy9pfsu72oSpiMbeks1c8K9K6aDiUGj3xoAmVMhGuia3JFmIEsWKXOLj61SeUAN 2sfOgso3U4LolyY41x/q+aeG373ktB1XHtDbT4UBT4W2KPtdf0h3HUQsKYY8zXz9 PIlpefClIJnE8qyBX9V+jTS2sABG2nPJ86vhuISjxrFMXgZF90HRRSMWpIfX+4uz gOxfIm4udRUbH5zzxyDZn7sP9f6VUGPqdsgIHBHIp/LkExfuGH5EVIaXxO3jigJq Jze2htD+KfjbNfJRxyGR0AzwBeYh8sLI3vRemG2dip7+W2McddP+kxpY+CEtlBRG W1JhLa9pc+QuXkE4bUJAKBLje7mMhRdQK+zz2y782G5Z3FmepSW7ZXUSdNQX7ek6 YS5Uy+xpP4a4Jc2HRJsjWw8BK0Z5Ua/Bk1jC4PJ/SMvdHYvurPaUXzScayFiFjRA dNfuBikQssS4EvZIv0oaYxnGsihRncfWF+zfJt15CGy9IzfTgx1irvPPPzZ/eouM Z0h01oBStQ5HveSgGMBBjFK6u+bwPFoTMKhxqH/MM3z5m1GEXXdRvJuVSXraymqi H/WDi/BMVhBp0rbfpqSyHLmqsfNx3cPMAnjy1k/wOifJE14E4g4= =sQfb - -----END PGP SIGNATURE----- - --------------------------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: 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 iQIVAwUBXHxpxGaOgq3Tt24GAQiBZhAAvh4J8EMOsnv0QSdFWLntHsp/m/blfK8/ KCCelinXP1xdsRQN4XHufM8OsHsiu81ZO77aPuKHTxHKSDDljpjAo5EGLzDHhqZv K+6h8gXa2oj60++nlUBZ3H/MI6twVNjJAQ4XoL83HDT7qMdLank3h8Krgm3JYUAg ivEM/aI70+lfDn3FXP7s08ofjwhN1KlGbAzrgiJskEJ1zKm6aLIUTXrlPkmS+Qhq nL1QOzhiM6Bbt+LAM5QsVPRmNs1txckhpq3uNmz27ar1bwS+bEvZvLlMkFTSm1T3 d55EhTnlFwQPOALI8VgPLkQ+5lp9OB/z/3j9JukTVgeefSVodwuUW32b3snFrjdi MAQelIgraXFbzjVspuBvVoUmZ22sHacTUr4GwlKwp3g9NNSlywJ+Hcx+kL9A81u9 21zHzBNuHm/v09OsrbPSYYdgBSAvIKie+kkBATM3x1KKeMOLsisTZncKe1iUbopu 02zLYQqh9DPJi+/kEFdro9sE4mzYa7QtGyh/iCytE9KPJgQz7tA5NDMyU5q1eTsW sjgbIPZBAdzlMZEXE5goeqgfWeHc1lmU0Iy80M1/nf7de0m8+6/6SrA+1f4A1Oz7 aXoTzT7hEb32zqvApuME+GR0REtVdY4/GJO7Xnybmb4TAiwVMAP4oKdz83MoLHCu tdASEDzeklE= =t3iB -----END PGP SIGNATURE-----