CVE-2017-3732

Summary

There is a carry propagating bug in the x86_64 Montgomery squaring procedure in OpenSSL 1.0.2 before 1.0.2k and 1.1.0 before 1.1.0d. 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. Note: This issue is very similar to CVE-2015-3193 but must be treated as a separate problem.

Affected Software

VendorProductVersion RangeStatus
OpenSSLOpenSSLopenssl-1.1.0affected
OpenSSLOpenSSLopenssl-1.1.0aaffected
OpenSSLOpenSSLopenssl-1.1.0baffected
OpenSSLOpenSSLopenssl-1.1.0caffected
OpenSSLOpenSSLopenssl-1.0.2affected
OpenSSLOpenSSLopenssl-1.0.2aaffected
OpenSSLOpenSSLopenssl-1.0.2baffected
OpenSSLOpenSSLopenssl-1.0.2caffected
OpenSSLOpenSSLopenssl-1.0.2daffected
OpenSSLOpenSSLopenssl-1.0.2eaffected
OpenSSLOpenSSLopenssl-1.0.2faffected
OpenSSLOpenSSLopenssl-1.0.2gaffected
OpenSSLOpenSSLopenssl-1.0.2haffected
OpenSSLOpenSSLopenssl-1.0.2iaffected
OpenSSLOpenSSLopenssl-1.0.2jaffected

Weaknesses

  • carry-propagating bug

ADP Enrichment

CVE Program Container

Additional References

References