FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

FreeBSD -- OpenSSL multiple vulnerabilities

Affected packages
11.1 <= FreeBSD < 11.1_6
10.4 <= FreeBSD < 10.4_5
10.3 <= FreeBSD < 10.3_26


VuXML ID 9f7a0f39-ddc0-11e7-b5af-a4badb2f4699
Discovery 2017-12-09
Entry 2017-12-10

Problem Description:

Invoking SSL_read()/SSL_write() while in an error state causes data to be passed without being decrypted/encrypted directly from the SSL/TLS record layer.

In order to exploit this issue an application bug would have to be present that resulted in a call to SSL_read()/SSL_write() being issued after having already received a fatal error. [CVE-2017-3737]

There is an overflow bug in the x86_64 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli. This only affects processors that support the AVX2 but not ADX extensions like Intel Haswell (4th generation). [CVE-2017-3738] This bug only affects FreeBSD 11.x.


Applications with incorrect error handling may inappropriately pass unencrypted data. [CVE-2017-3737]

Mishandling of carry propagation will produce incorrect output, and make it easier for a remote attacker to obtain sensitive private-key information. No EC algorithms are affected and 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 DH1024 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. However, for an attack on TLS to be meaningful, the server would have to share the DH1024 private key among multiple clients, which is no longer an option since CVE-2016-0701. [CVE-2017-3738]


CVE Name CVE-2016-0701
CVE Name CVE-2017-3737
CVE Name CVE-2017-3738
FreeBSD Advisory SA-17:12.openssl