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As per the (unconfirmed) report in https://github.com/jtesta/ssh-audit/issues/159, the following steps may be used to harden Dropbear:
The current release of dropbear can be hardened by building it adding the following three lines to localoptions.h:
localoptions.h
#define DROPBEAR_RSA_SHA1 0 #define DROPBEAR_DH_GROUP14_SHA1 0 #define DROPBEAR_SHA1_HMAC 0
Reference: https://github.com/mkj/dropbear/issues/138