rsaz_1024_mul_avx2 overflow bug on x86_64 (CVE-2017-3738)

  • 7022627
  • 31-Jan-2018
  • 31-Jan-2018


Reflection Desktop 16.1 version 16.1.348 and earlier
InfoConnect Desktop 16.1 version 16.1.348 and earlier


There is an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli. 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 DH1024 are considered just feasible, 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 significant. 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.


This issue is addressed in Reflection/InfoConnect Desktop 16.1 version 16.1.362 and higher.


Security Alert

Additional Information

For vulnerability details, see the National Vulnerability Database: