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CVE-2015-1794

Status Candidate

Overview

The ssl3_get_key_exchange function in ssl/s3_clnt.c in OpenSSL 1.0.2 before 1.0.2e allows remote servers to cause a denial of service (segmentation fault) via a zero p value in an anonymous Diffie-Hellman (DH) ServerKeyExchange message.

Related Files

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
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 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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