| id: GO-2021-0239 |
| modules: |
| - module: std |
| versions: |
| - fixed: 1.15.13 |
| - introduced: 1.16.0-0 |
| - fixed: 1.16.5 |
| vulnerable_at: 1.16.4 |
| packages: |
| - package: net |
| symbols: |
| - Resolver.LookupAddr |
| - Resolver.LookupCNAME |
| - Resolver.LookupMX |
| - Resolver.LookupNS |
| - Resolver.LookupSRV |
| skip_fix: 'TODO: revisit this reason (fix appears to not work with Go <1.18)' |
| summary: Improper sanitization when resolving values from DNS in net |
| description: |- |
| The LookupCNAME, LookupSRV, LookupMX, LookupNS, and LookupAddr functions and |
| their respective methods on the Resolver type may return arbitrary values |
| retrieved from DNS which do not follow the established RFC 1035 rules for domain |
| names. If these names are used without further sanitization, for instance |
| unsafely included in HTML, they may allow for injection of unexpected content. |
| Note that LookupTXT may still return arbitrary values that could require |
| sanitization before further use. |
| published: 2022-02-17T17:33:35Z |
| cves: |
| - CVE-2021-33195 |
| credits: |
| - Philipp Jeitner |
| - Haya Shulman from Fraunhofer SIT |
| references: |
| - fix: https://go.dev/cl/320949 |
| - fix: https://go.googlesource.com/go/+/c89f1224a544cde464fcb86e78ebb0cc97eedba2 |
| - web: https://groups.google.com/g/golang-announce/c/RgCMkAEQjSI |
| - report: https://go.dev/issue/46241 |
| review_status: REVIEWED |
