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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.2841 OpenSSL Security Advisory [10 Nov 2016] 1 December 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: OpenSSL Publisher: OpenSSL Operating System: UNIX variants (UNIX, Linux, OSX) Windows Impact/Access: Access Privileged Data -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2016-7055 CVE-2016-7054 CVE-2016-7053 Reference: ASB-2016.0114 ESB-2016.2770 Original Bulletin: https://www.openssl.org/news/secadv/20161110.txt - --------------------------BEGIN INCLUDED TEXT-------------------- OpenSSL Security Advisory [10 Nov 2016] ======================================== ChaCha20/Poly1305 heap-buffer-overflow (CVE-2016-7054) ====================================================== Severity: High TLS connections using *-CHACHA20-POLY1305 ciphersuites are susceptible to a DoS attack by corrupting larger payloads. This can result in an OpenSSL crash. This issue is not considered to be exploitable beyond a DoS. OpenSSL 1.1.0 users should upgrade to 1.1.0c This issue does not affect OpenSSL versions prior to 1.1.0 This issue was reported to OpenSSL on 25th September 2016 by Robert Swiecki (Google Security Team), and was found using honggfuzz. The fix was developed by Richard Levitte of the OpenSSL development team. CMS Null dereference (CVE-2016-7053) ==================================== Severity: Moderate Applications parsing invalid CMS structures can crash with a NULL pointer dereference. This is caused by a bug in the handling of the ASN.1 CHOICE type in OpenSSL 1.1.0 which can result in a NULL value being passed to the structure callback if an attempt is made to free certain invalid encodings. Only CHOICE structures using a callback which do not handle NULL value are affected. OpenSSL 1.1.0 users should upgrade to 1.1.0c This issue does not affect OpenSSL versions prior to 1.1.0 This issue was reported to OpenSSL on 12th October 2016 by Tyler Nighswander of ForAllSecure. The fix was developed by Stephen Henson of the OpenSSL development team. Montgomery multiplication may produce incorrect results (CVE-2016-7055) ======================================================================= Severity: Low There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure that handles input lengths divisible by, but longer than 256 bits. Analysis suggests that attacks against RSA, DSA and DH private keys are impossible. This is because the subroutine in question is not used in operations with the private key itself and an input of the attacker's direct choice. Otherwise the bug can manifest itself as transient authentication and key negotiation failures or reproducible erroneous outcome of public-key operations with specially crafted input. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation. Impact was not analyzed in detail, because pre-requisites for attack are considered unlikely. Namely multiple clients have to choose the curve in question and the server has to share the private key among them, neither of which is default behaviour. Even then only clients that chose the curve will be affected. OpenSSL 1.1.0 users should upgrade to 1.1.0c This issue does not affect OpenSSL versions prior to 1.0.2. Due to the low severity of this defect we are not issuing a new 1.0.2 release at this time. We recommend that 1.0.2 users wait for the next 1.0.2 release for the fix to become available. The fix is also available in the OpenSSL git repository in commit 57c4b9f6a2. This issue was publicly reported as transient failures and was not initially recognized as a security issue. Thanks to Richard Morgan for providing reproducible case. The fix was developed by Andy Polyakov of the OpenSSL development team. Note ==== As per our previous announcements and our Release Strategy (https://www.openssl.org/policies/releasestrat.html), support for OpenSSL version 1.0.1 will cease on 31st December 2016. No security updates for that version will be provided after that date. Users of 1.0.1 are advised to upgrade. Support for versions 0.9.8 and 1.0.0 ended on 31st December 2015. Those versions are no longer receiving security updates. References ========== URL for this Security Advisory: https://www.openssl.org/news/secadv/20161110.txt Note: the online version of the advisory may be updated with additional details over time. For details of OpenSSL severity classifications please see: https://www.openssl.org/policies/secpolicy.html - --------------------------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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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 iQIUAwUBWD+RUox+lLeg9Ub1AQhSFQ/1ExaHznXgoiWqMSPbThVNaugAERswxV5q L36IHdzL2+4qpQcAKWxQ1xA5bfaLNUCx1IZsIXA3SYOQ4nczad3ANXN6a4+SZSjj 6UQlfMAs20pisS7krKsaSYmmSdne0PBOZlTJbw6m5TwPhUOiOBDbeE07bAd8GHGk FS+37X40IwxUX7zJxHhS/Nj3LKzKXhQLSref0qYqDu2TJkzXCJRKFkHjxbLx14Qw YG9FTTADBFCM3T3uni2OViz6UYMEYLoD0t/tS9JUaUMvMKl993bcdWe4doZPL1Nj BoQqr6XP94Vr7fmBoYmH63HhklcGmsgOC6vm55tee16ZAU8oK8UvAiv0fS5J5MQq mmA295yP2oeCwh1aM/U1xTJWF+Fz1qLOwTezlF4E27x8MMBesvy+FewMh4+gWSca MoNXpeWZyDRClOpNLfhlgu05y4FGYfKR+P1uCShY8X3HDoYso5TUykiCgkDoKknP QhCpppsMUUsbGX4JA+znn4W0H+2JayaSPlWsSBh/vRTkVYZDJMMrC1DFtg2QHHJ/ tf47/oSieJ9OrXa0g1uAU7zGDxRJhujnUYPqvC+JSi9Gqk4ANdnXabnZkbMJwCbo +IyB4C04N5PDm+PkctlFYBcbcgawTWLgw2owDUHtMjUlSDlGBzSMNCUPra/PmNvu ju5cp1qoIA== =9Ycb -----END PGP SIGNATURE-----