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CVE-2015-3193

Status Candidate

Overview

The Montgomery squaring implementation in crypto/bn/asm/x86_64-mont5.pl in OpenSSL 1.0.2 before 1.0.2e on the x86_64 platform, as used by the BN_mod_exp function, mishandles carry propagation and produces incorrect output, which makes it easier for remote attackers to obtain sensitive private-key information via an attack against use of a (1) Diffie-Hellman (DH) or (2) Diffie-Hellman Ephemeral (DHE) ciphersuite.

Related Files

OpenSSL Security Advisory 20180327
Posted Mar 27, 2018
Site openssl.org

OpenSSL Security Advisory 20180327 - Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so this is considered safe. Other issues were also addressed.

tags | advisory, denial of service
advisories | CVE-2015-3193, CVE-2016-0701, CVE-2017-3732, CVE-2017-3736, CVE-2017-3738, CVE-2018-0733, CVE-2018-0739
SHA-256 | 06f896618c972892739490677cca48ef1283e588c8790590bbec26307dcc26b6
OpenSSL Security Advisory 20171207
Posted Dec 7, 2017
Site openssl.org

OpenSSL Security Advisory 20171207 - OpenSSL 1.0.2 (starting from version 1.0.2b) introduced an "error state" mechanism. The intent was that if a fatal error occurred during a handshake then OpenSSL would move into the error state and would immediately fail if you attempted to continue the handshake. This works as designed for the explicit handshake functions (SSL_do_handshake(), SSL_accept() and SSL_connect()), however due to a bug it does not work correctly if SSL_read() or SSL_write() is called directly. In that scenario, if the handshake fails then a fatal error will be returned in the initial function call. If SSL_read()/SSL_write() is subsequently called by the application for the same SSL object then it will succeed and the data is passed without being decrypted/encrypted directly from the SSL/TLS record layer. Other issues were also addressed.

tags | advisory
advisories | CVE-2015-3193, CVE-2016-0701, CVE-2017-3732, CVE-2017-3736, CVE-2017-3737, CVE-2017-3738
SHA-256 | 5b23d35b31c30e0ba27356ef231c18b5e034386ca01935b4c9740a2cf6a7469b
OpenSSL Security Advisory 20171102
Posted Nov 2, 2017
Site openssl.org

OpenSSL Security Advisory 20171102 - There is a carry propagating bug in the x86_64 Montgomery squaring procedure. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be very significant and likely only accessible to a limited number of attackers. An attacker would additionally need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients. Other issues were also addressed.

tags | advisory
advisories | CVE-2015-3193, CVE-2017-3732, CVE-2017-3735, CVE-2017-3736
SHA-256 | 13c8f9e7efe4df4ea9e45017af978e35c3f09aa73ff4826ac18d619f1512c340
HPE Security Bulletin HPESBHF03709 1
Posted Feb 23, 2017
Authored by Hewlett Packard Enterprise | Site hpe.com

HPE Security Bulletin HPESBHF03709 1 - Potential security vulnerabilities with OpenSSL have been addressed for HPE Network products including Comware 5, Comware 7, IMC, and VCX. The vulnerabilities could be remotely exploited resulting in Denial of Service (DoS) or disclosure of sensitive information. Revision 1 of this advisory.

tags | advisory, denial of service, vulnerability
advisories | CVE-2015-1794, CVE-2015-3193, CVE-2015-3194, CVE-2015-3195, CVE-2015-3196
SHA-256 | 414ea6f3c5b3e7999c29f72f9d98f7564c65daca2564e45323cbaa2b1fe411c3
OpenSSL Security Advisory 20170126
Posted Jan 26, 2017
Site openssl.org

OpenSSL Security Advisory 20170126 - If an SSL/TLS server or client is running on a 32-bit host, and a specific cipher is being used, then a truncated packet can cause that server or client to perform an out-of-bounds read, usually resulting in a crash. Other issues were also addressed.

tags | advisory
advisories | CVE-2015-3193, CVE-2016-7055, CVE-2017-3730, CVE-2017-3731, CVE-2017-3732
SHA-256 | 457838ec233230687d717bc896db28bd57340df047d0575d696435c9376532d2
Apple Security Advisory 2016-10-27-1
Posted Oct 28, 2016
Authored by Apple | Site apple.com

Apple Security Advisory 2016-10-27-1 - Xcode 8.1 is now available and addresses code execution vulnerabilities.

tags | advisory, vulnerability, code execution
systems | apple
advisories | CVE-2015-3193, CVE-2015-3194, CVE-2015-6764, CVE-2015-8027, CVE-2016-0702, CVE-2016-0705, CVE-2016-0797, CVE-2016-1669, CVE-2016-2086, CVE-2016-2216
SHA-256 | df4e9e18d07031af03162429c5cf5f429609a92fcbc73263b3a265198afd9ef3
Slackware Security Advisory - bind Updates
Posted Dec 16, 2015
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New bind packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix security issues.

tags | advisory
systems | linux, slackware
advisories | CVE-2015-3193, CVE-2015-8000, CVE-2015-8461
SHA-256 | 954fcd7265ef6b16e0e2b91fc3328efa7624c4c4eb6ff428f6cd80aaed80cb56
Slackware Security Advisory - openssl Updates
Posted Dec 16, 2015
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New openssl packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix security issues.

tags | advisory
systems | linux, slackware
advisories | CVE-2015-1794, CVE-2015-3193, CVE-2015-3194, CVE-2015-3195, CVE-2015-3196
SHA-256 | 45bb3f03083cb964bed263c45381e6d8ca8c6ec617a2e8a70c6797a36ef40a21
Ubuntu Security Notice USN-2830-1
Posted Dec 7, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2830-1 - Guy Leaver discovered that OpenSSL incorrectly handled a ServerKeyExchange for an anonymous DH ciphersuite with the value of p set to 0. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only applied to Ubuntu 15.10. Hanno B=C3=B6ck discovered that the OpenSSL Montgomery squaring procedure algorithm may produce incorrect results when being used on x86_64. A remote attacker could possibly use this issue to break encryption. This issue only applied to Ubuntu 15.10. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2015-1794, CVE-2015-3193, CVE-2015-3194, CVE-2015-3195, CVE-2015-3196
SHA-256 | 761017edeff7bb2093ce7156fbf414bd65c92ad0dc41998bcfdcc88bf2e0d511
OpenSSL Toolkit 1.0.2e
Posted Dec 3, 2015
Site openssl.org

OpenSSL is a robust, fully featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols with full-strength cryptography world-wide.

Changes: Fix applied to BN_mod_exp which may produce incorrect results on x86_64. Also addressed was a certificate verify crash with missing PSS parameter, an X509_ATTRIBUTE memory leak, and various other issues.
tags | tool, encryption, protocol
systems | unix
advisories | CVE-2015-3193, CVE-2015-3194, CVE-2015-3195
SHA-256 | eee11def03647aa2267434a779608af6fca645023c9a194ddb82f14426835537
OpenSSL Security Advisory 20151203
Posted Dec 3, 2015
Site openssl.org

OpenSSL Security Advisory 20151203 - There is a carry propagating bug in the x86_64 Montgomery squaring procedure. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be very significant and likely only accessible to a limited number of attackers. An attacker would additionally need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients. For example this can occur by default in OpenSSL DHE based SSL/TLS ciphersuites. Other issues were also addressed.

tags | advisory
advisories | CVE-2015-1794, CVE-2015-3193, CVE-2015-3194, CVE-2015-3195, CVE-2015-3196
SHA-256 | 47226417fb16c4f755233423cc8e871f0e4f6f54208d5c74b1e9fb97ec335763
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