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cmd/go: go.mod toolchain directive allows arbitrary execution (CVE-2023-39320) [1.21 backport] #62394

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gopherbot opened this issue Aug 31, 2023 · 2 comments
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cmd/go: go.mod toolchain directive allows arbitrary execution (CVE-2023-39320) [1.21 backport] #62394

gopherbot opened this issue Aug 31, 2023 · 2 comments
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CherryPickApproved Used during the release process for point releases FrozenDueToAge release-blocker Security
Milestone
Go1.21.1

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@gopherbot
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gopherbot commented Aug 31, 2023 •
edited by cherrymui
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The go.mod toolchain directive, introduced in Go 1.21, could be leveraged to
execute scripts and binaries relative to the root of the module when the "go"
command was executed within the module. This applies to modules downloaded using
the "go" command from the module proxy, as well as modules downloaded directly
using VCS software.

Thanks to Juho Nurminen of Mattermost for reporting this issue.

This is CVE-2023-39320 and Go issue https://go.dev/issue/62198.

@rolandshoemaker requested issue #62198 to be considered for backport to the next 1.21 minor release.

@gopherbot please open backport issues.
@gopherbot gopherbot added CherryPickCandidate Used during the release process for point releases Security labels Aug 31, 2023
@gopherbot gopherbot mentioned this issue Aug 31, 2023
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@gopherbot gopherbot added this to the Go1.21.1 milestone Aug 31, 2023
@rolandshoemaker rolandshoemaker added CherryPickApproved Used during the release process for point releases and removed CherryPickCandidate Used during the release process for point releases labels Aug 31, 2023
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Change https://go.dev/cl/526095 mentions this issue: [release-branch.go1.21] cmd/go: reject toolchain directives containing path separators

gopherbot pushed a commit that referenced this issue Sep 6, 2023
@cherrymui
[release-branch.go1.21] cmd/go: reject toolchain directives containin…
d25a935 
…g path separators

If GOTOOLCHAIN="path" or "auto", the go command uses exec.LookPath to
search for it in order to allow toolchains to refer to local-only
toolchain variants (such as toolchains built from enterprise- or
distro-patched source). However, those toolchains should only be
resolved from $PATH, not relative to the working directory of the
command.

Thanks to Juho Nurminen of Mattermost for reporting this issue.

Fixes #62198.
Fixes #62394.
Fixes CVE-2023-39320.

Change-Id: I247c7acea95d737362dd0475e9fc8515430d0fcc
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1996318
Run-TryBot: Roland Shoemaker <bracewell@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Roland Shoemaker <bracewell@google.com>
(cherry picked from commit e41c0a55d45e9a9acbc5d7c1143ea4fff8fb9283)
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/2014013
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Tatiana Bradley <tatianabradley@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/526095
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Cherry Mui <cherryyz@google.com>
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Closed by merging d25a935 to release-branch.go1.21.

@cherrymui cherrymui changed the title security: fix CVE-2023-39320 [1.21 backport] cmd/go: go.mod toolchain directive allows arbitrary execution (CVE-2023-39320) [1.21 backport] Sep 6, 2023
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