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crypto/ecdsa: P521 ecdsa.Verify panics with malformed message [1.20 backport] #60744

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gopherbot opened this issue Jun 12, 2023 · 2 comments
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crypto/ecdsa: P521 ecdsa.Verify panics with malformed message [1.20 backport] #60744

gopherbot opened this issue Jun 12, 2023 · 2 comments
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CherryPickApproved Used during the release process for point releases
Milestone
Go1.20.6

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@gopherbot
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@FiloSottile requested issue #60741 to be considered for backport to the next 1.20 minor release.

@gopherbot please open a Go 1.20 backport.

I think this doesn't have security impact because ECDSA hashes are not attacker-controlled and no one has a 528 hash laying around, but it's a spec deviation leading to a panic, so might as well fix it in Go 1.21 and backport it.
@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label Jun 12, 2023
@gopherbot gopherbot mentioned this issue Jun 12, 2023
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@gopherbot gopherbot added this to the Go1.20.6 milestone Jun 12, 2023
@gopherbot
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Change https://go.dev/cl/502915 mentions this issue: [release-branch.go1.20] crypto/ecdsa: properly truncate P-521 hashes

@prattmic prattmic added the CherryPickApproved Used during the release process for point releases label Jun 14, 2023
@gopherbot gopherbot removed the CherryPickCandidate Used during the release process for point releases label Jun 14, 2023
gopherbot pushed a commit that referenced this issue Jun 19, 2023
@FiloSottile @gopherbot
[release-branch.go1.20] crypto/ecdsa: properly truncate P-521 hashes
a7a48fa 
Before, if a hash was exactly 66 bytes long, we weren't truncating it
for use with P-521, because the byte length was not overflowing.
However, the bit length could still overflow.

Fixes #60744
Updates #60741

Change-Id: I37a0ee210add0eb566e6dc1c141e83e992983eb6
Reviewed-on: https://go-review.googlesource.com/c/go/+/502478
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
(cherry picked from commit 886fba5)
Reviewed-on: https://go-review.googlesource.com/c/go/+/502915
Auto-Submit: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
@gopherbot
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Closed by merging a7a48fa to release-branch.go1.20.

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