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crypto/elliptic: CPU DoS vulnerability affecting P-521 and P-384 #29903

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julieqiu opened this issue Jan 23, 2019 · 8 comments
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crypto/elliptic: CPU DoS vulnerability affecting P-521 and P-384 #29903

julieqiu opened this issue Jan 23, 2019 · 8 comments
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FrozenDueToAge Security
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Go1.12

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@julieqiu
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julieqiu commented Jan 23, 2019 •
edited by FiloSottile
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A DoS vulnerability in the crypto/elliptic implementations of the P-521 and P-384 elliptic curves may let an attacker craft inputs that consume excessive amounts of CPU.

These inputs might be delivered via TLS handshakes, X.509 certificates, JWT tokens, ECDH shares or ECDSA signatures. In some cases, if an ECDH private key is reused more than once, the attack can also lead to key recovery.

This issue is CVE-2019-6486. It was found and reported by the Wycheproof project.
@julieqiu julieqiu added this to the Go1.12 milestone Jan 23, 2019
This was referenced Jan 23, 2019
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@gopherbot
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Change https://golang.org/cl/159218 mentions this issue: crypto/elliptic: reduce subtraction term to prevent long busy loop

@alex alex mentioned this issue Jan 23, 2019
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@mirtchovski
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Can you elaborate on this, thank you:

"if an ECDH private key is reused more than once, the attack can also lead to key recovery."

This was referenced Jan 23, 2019
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@FiloSottile
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FiloSottile commented Jan 24, 2019 •
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Can you elaborate on this, thank you:

"if an ECDH private key is reused more than once, the attack can also lead to key recovery."

If ECDH is used in an Ephemeral-Static protocol, the attacker can use multiple tries to recover the static private key. crypto/tls does not reuse ECDH private keys, so is unaffected, but certain JWT encryption modes are based on ECDH-ES, so would be affected if the private key is a P-384 or P-521 key.

@cblecker cblecker mentioned this issue Jan 24, 2019
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@pawanrawal
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pawanrawal commented Jan 24, 2019 •
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Was this issue introduced with go v1.10? Should we be updating projects using versions below v1.10?

kopano-bot pushed a commit to Kopano-dev/libkcoidc that referenced this issue Jan 24, 2019
@longsleep
Add Go 1.10 as minimal requirement
0be89cc 
Reference: golang/go#29903
This was referenced Jan 24, 2019
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@andypost andypost mentioned this issue Jan 24, 2019
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gentoo-bot pushed a commit to gentoo/gentoo that referenced this issue Jan 24, 2019
@william-hubbs @williamh
dev-lang/go: 1.10.8 and 1.11.5 security bumps
7783b14 
This is going directly to stable on amd64.
Bug: golang/go#29903
Copyright: Sony Interactive Entertainment Inc.
Package-Manager: Portage-2.3.56, Repoman-2.3.12
RepoMan-Options: --force

Signed-off-by: William Hubbs <[email protected]>
clrpackages pushed a commit to clearlinux-pkgs/go that referenced this issue Jan 24, 2019
@phmccarty @djklimes
Update to 1.11.5
fc0d3a5 
Resolves CVE-2019-6486. See details at
golang/go#29903.

Signed-off-by: Patrick McCarty <[email protected]>
@dlisin dlisin mentioned this issue Jan 24, 2019
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@FiloSottile
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Was this issue introduced with go v1.10? Should we be updating projects using versions below v1.10?

No, this was introduced earlier, but we only support the last two Go releases.

@remyoudompheng
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Out of curiosity, why didn't we remove this "Add(P)" altogether ? Mod(P) is always called afterwards and the specification of big.Int.Mod says it will never return a negative number if P > 0.

@FiloSottile
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@remyoudompheng Security patches aim to be as minimal as possible. A follow-up change will indeed significantly simplify that function.

mvladev pushed a commit to mvladev/gardener that referenced this issue Jan 25, 2019
Upgrade golang version to 1.11.5
cb66e2f 
golang issue golang/go#29903
K8S issue kubernetes/kubernetes#73238
@mvladev mvladev mentioned this issue Jan 25, 2019
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mvladev pushed a commit to gardener-attic/gardener-extensions that referenced this issue Jan 25, 2019
Update golang version to 1.11.5
98e8705 
**What this PR does / why we need it**:

> We have just released Go 1.11.5 and Go 1.10.8 to address a recently reported security issue. We recommend that all users update to one of these releases (if you’re not sure which, choose Go 1.11.5).
>
> This DoS vulnerability in the crypto/elliptic implementations of the P-521 and P-384 elliptic curves may let an attacker craft inputs that consume excessive amounts of CPU.
>
> These inputs might be delivered via TLS handshakes, X.509 certificates, JWT tokens, ECDH shares or ECDSA signatures. In some cases, if an ECDH private key is reused more than once, the attack can also lead to key recovery.
>
> The issue is CVE-2019-6486 and Go issue golang/go#29903. See the Go issue for more details.

K8S issue kubernetes/kubernetes#73238

**Which issue(s) this PR fixes**:
n/a

**Special notes for your reviewer**:

**Release note**:
<!--  Write your release note:
1. Enter your release note in the below block.
2. If no release note is required, just write "NONE" within the block.

Format of block header: <category> <target_group>
Possible values:
- category:       improvement|noteworthy|action
- target_group:   user|operator
-->
```improvement operator
NONE
```

/cc @ThormaehlenFred
@mvladev mvladev mentioned this issue Jan 25, 2019
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@aaslamin aaslamin mentioned this issue Jan 25, 2019
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@aaslamin aaslamin mentioned this issue Jan 25, 2019
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This was referenced Jan 28, 2019
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russjones pushed a commit to gravitational/go that referenced this issue Jan 28, 2019
@FiloSottile @russjones
crypto/elliptic: reduce subtraction term to prevent long busy loop
c223ac0 
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 golang#29903

Change-Id: Ia969e8b5bf5ac4071a00722de9d5e4d856d8071a
Reviewed-on: https://team-review.git.corp.google.com/c/399777
Reviewed-by: Adam Langley <[email protected]>
Reviewed-by: Julie Qiu <[email protected]>
Reviewed-on: https://go-review.googlesource.com/c/159218
Reviewed-by: Julie Qiu <[email protected]>
Mic92 pushed a commit to NixOS/nixpkgs that referenced this issue Jan 29, 2019
@vcunat @Mic92
go_1_9: mark as insecure (see the parent commit)
5a3e195 
Upstream only supports two latest releases.
golang/go#29903 (comment)

(cherry picked from commit a687ef9)
@akostibas akostibas mentioned this issue Jan 30, 2019
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@alessio alessio mentioned this issue Jan 31, 2019
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@tuliom tuliom mentioned this issue Feb 1, 2019
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@FiloSottile
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This was not mentioned in the announcement by my mistake, but this issue was found by running Wycheproof test vectors, and reported by the Wycheproof team.

richardyuwen pushed a commit to richardyuwen/gardener that referenced this issue Mar 26, 2019
Upgrade golang version to 1.11.5
8a35b59 
golang issue golang/go#29903
K8S issue kubernetes/kubernetes#73238
@golang golang locked and limited conversation to collaborators Mar 13, 2020
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