69 lines
3.0 KiB
Diff
69 lines
3.0 KiB
Diff
From 07bc2d7e8860729723c181653e8416ee0eba4070 Mon Sep 17 00:00:00 2001
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From: Danish Prakash <contact@danishpraka.sh>
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Date: Tue, 15 Oct 2024 22:23:52 +0530
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Subject: [PATCH 4/5] Properly validate cache IDs and sources
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The `--mount type=cache` argument to the `RUN` instruction in
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Dockerfiles was using `filepath.Join` on user input, allowing
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crafted paths to be used to gain access to paths on the host,
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when the command should normally be limited only to Buildah;s own
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cache and context directories. Switch to `filepath.SecureJoin` to
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resolve the issue.
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Fixes CVE-2024-9675
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Signed-off-by: Matt Heon <mheon@redhat.com>
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Signed-off-by: Danish Prakash <contact@danishpraka.sh>
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---
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.../buildah/internal/volumes/volumes.go | 19 ++++++++++++++-----
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1 file changed, 14 insertions(+), 5 deletions(-)
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diff --git a/vendor/github.com/containers/buildah/internal/volumes/volumes.go b/vendor/github.com/containers/buildah/internal/volumes/volumes.go
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index 554c9ac0debc..f20b254ef7d9 100644
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--- a/vendor/github.com/containers/buildah/internal/volumes/volumes.go
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+++ b/vendor/github.com/containers/buildah/internal/volumes/volumes.go
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@@ -23,6 +23,7 @@ import (
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"github.com/containers/storage/pkg/idtools"
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"github.com/containers/storage/pkg/lockfile"
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"github.com/containers/storage/pkg/unshare"
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+ digest "github.com/opencontainers/go-digest"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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selinux "github.com/opencontainers/selinux/go-selinux"
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)
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@@ -373,7 +374,11 @@ func GetCacheMount(args []string, store storage.Store, imageMountLabel string, a
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return newMount, nil, fmt.Errorf("no stage found with name %s", fromStage)
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}
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// path should be /contextDir/specified path
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- newMount.Source = filepath.Join(mountPoint, filepath.Clean(string(filepath.Separator)+newMount.Source))
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+ evaluated, err := copier.Eval(mountPoint, string(filepath.Separator)+newMount.Source, copier.EvalOptions{})
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+ if err != nil {
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+ return newMount, nil, err
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+ }
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+ newMount.Source = evaluated
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} else {
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// we need to create cache on host if no image is being used
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@@ -390,11 +395,15 @@ func GetCacheMount(args []string, store storage.Store, imageMountLabel string, a
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}
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if id != "" {
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- newMount.Source = filepath.Join(cacheParent, filepath.Clean(id))
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- buildahLockFilesDir = filepath.Join(BuildahCacheLockfileDir, filepath.Clean(id))
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+ // Don't let the user control where we place the directory.
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+ dirID := digest.FromString(id).Encoded()[:16]
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+ newMount.Source = filepath.Join(cacheParent, dirID)
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+ buildahLockFilesDir = filepath.Join(BuildahCacheLockfileDir, dirID)
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} else {
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- newMount.Source = filepath.Join(cacheParent, filepath.Clean(newMount.Destination))
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- buildahLockFilesDir = filepath.Join(BuildahCacheLockfileDir, filepath.Clean(newMount.Destination))
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+ // Don't let the user control where we place the directory.
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+ dirID := digest.FromString(newMount.Destination).Encoded()[:16]
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+ newMount.Source = filepath.Join(cacheParent, dirID)
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+ buildahLockFilesDir = filepath.Join(BuildahCacheLockfileDir, dirID)
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}
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idPair := idtools.IDPair{
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UID: uid,
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--
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2.46.0
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