GO-2021-0319

vendorUSosv

Incorrect computation for some invalid field elements in crypto/elliptic

view advisory published 2022-05-23Licence: per source

Some big.Int values that are not valid field elements (negative or overflowing) might cause Curve.IsOnCurve to incorrectly return true. Operating on those values may cause a panic or an invalid curve operation. Note that Unmarshal will never return such values.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2022-23806US	critical9.1	3.07% (88th)	—	2022-02-11
Curve.IsOnCurve in crypto/elliptic in Go before 1.16.14 and 1.17.x before 1.17.7 can incorrectly return true in situations with a big.Int value that is not a valid field element.

references

External citations — patches, advisories, analysis.

https://go.dev/cl/382455FIX
https://go.dev/issue/50974REPORT
https://go.googlesource.com/go/+/7f9494c277a471f6f47f4af3036285c0b1419816FIX
https://groups.google.com/g/golang-announce/c/SUsQn0aSgPQWEB

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