| commit | 193c16a3648b8670a762e925b6ac6e074f468a20 | [log] [tgz] |
|---|---|---|
| author | Filippo Valsorda <filippo@golang.org> | Tue Jan 22 16:02:41 2019 -0500 |
| committer | Filippo Valsorda <filippo@golang.org> | Wed Jan 23 22:01:56 2019 +0000 |
| tree | 3a37276359c683e8270394e562b281f894c9c3cf | |
| parent | 1e450aa2f208046aab0628e024a70c5193559fe7 [diff] |
crypto/elliptic: reduce subtraction term to prevent long busy loop If beta8 is unusually large, the addition loop might take a very long time to bring x3-beta8 back positive. This would lead to a DoS vulnerability in the implementation of the P-521 and P-384 elliptic curves that may let an attacker craft inputs to ScalarMult that consume excessive amounts of CPU. This fixes CVE-2019-6486. Fixes #29903 Change-Id: Ia969e8b5bf5ac4071a00722de9d5e4d856d8071a Reviewed-on: https://team-review.git.corp.google.com/c/399777 Reviewed-by: Adam Langley <agl@google.com> Reviewed-by: Julie Qiu <julieqiu@google.com> Reviewed-on: https://go-review.googlesource.com/c/159218 Reviewed-by: Julie Qiu <julie@golang.org>
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