GHSA-ffhg-7mh4-33c4 CVE-2020-9283 GO-2020-0012
Improper Verification of Cryptographic Signature in golang.org/x/crypto
- Severity
- 7.5 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- 20.89%
- Chance of exploitation in the next 30 days. Higher than 97.56% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-347 Improper Verification of Cryptographic Signature
- Fix
0.0.0-20200220183623-bac4c82f6975- Upgrade golang.org/x/crypto to this version or later
Description
golang.org/x/crypto before v0.0.0-20200220183623-bac4c82f6975 for Go allows a panic during signature verification in the golang.org/x/crypto/ssh package. A client can attack an SSH server that accepts public keys. Also, a server can attack any SSH client.
Affected versions
Go
| Package | Vulnerable | Fixed in |
|---|---|---|
| golang.org/x/crypto | < 0.0.0-20200220183623-bac4c82f6975 |
0.0.0-20200220183623-bac4c82f6975 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
golang.org/x/crypto Go → 0.0.0-20200220183623-bac4c82f6975
- go
go get golang.org/x/crypto@v0.0.0-20200220183623-bac4c82f6975 && go mod tidy
Severity breakdown
CVSS 3.1 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Weakness
CWE-347: Improper Verification of Cryptographic Signature
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
References
Advisories
Packages
Other links
- github.com/golang/crypto/commit/bac4c82f69751a6dd76e702d54b3ceb88adab236
- go.dev/cl/220357
- go.googlesource.com/crypto/+/bac4c82f69751a6dd76e702d54b3ceb88adab236
- groups.google.com/forum
- groups.google.com/g/golang-announce/c/3L45YRc91SY
- lists.debian.org/debian-lts-announce/2020/10/msg00014.html
- lists.debian.org/debian-lts-announce/2020/11/msg00027.html
- lists.debian.org/debian-lts-announce/2020/11/msg00031.html
- pkg.go.dev/vuln/GO-2020-0012
- exploit-db.com/exploits/48121
- packetstormsecurity.com/files/156480/Go-SSH-0.0.2-Denial-Of-Service.html
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GO-2026-6355 Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh | High | Also affects golang.org/x/crypto |
| GO-2026-6354 Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh | High | Also affects golang.org/x/crypto |
| GO-2026-6303 Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh | High | Also affects golang.org/x/crypto |
| GO-2026-5932 The golang.org/x/crypto/openpgp package is unmaintained, unsafe by design, and has known security issues | Not rated yet | Also affects golang.org/x/crypto |
| GHSA-x527-x647-q7gg golang.org/x/crypto: Invoking VerifiedPublicKeyCallback permissions skip enforcement | Critical | Also affects golang.org/x/crypto |
| GHSA-w879-237q-wc7r golang.org/x/crypto: Invoking pathological RSA/DSA parameters may cause DoS | High | Also affects golang.org/x/crypto |
| GHSA-vgwf-h737-ff37 golang.org/x/crypto: Invoking client can cause server deadlock on unexpected responses | Critical | Also affects golang.org/x/crypto |
| GHSA-rm3j-f69w-wqmq golang.org/x/crypto vulnerable to infinite loop on large channel writes | Critical | Also affects golang.org/x/crypto |
Credits: Alex Gaynor, Fish in a Barrel
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