Improper sanitization when resolving values from DNS in net

高 7.3CVE-2021-33195 · BIT-golang-2021-33195 · GO-2021-0239 · 02/08/2021 公開 · 17/06/2026 更新

要点

CVE-2021-33195 は stdlib, go (golang) に影響する深刻度「高」 (CVSS 7.3) の脆弱性です。
今後30日間に悪用される確率（EPSS）：3.2%（全脆弱性の 88.2% より高い）。
対処：1.16.5, 1.15.13 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
stdlib Go	`≥ 1.16.0-0, < 1.16.5< 1.15.13`	`1.16.51.15.13`
go golang	`≥ 1.16.0, < 1.16.5< 1.15.13`	`1.16.51.15.13`

概要

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.

NVD の説明

Go before 1.15.13 and 1.16.x before 1.16.5 has functions for DNS lookups that do not validate replies from DNS servers, and thus a return value may contain an unsafe injection (e.g., XSS) that does not conform to the RFC1035 format.