Headline
GHSA-vfvj-3m3g-m532: fieldpath's Paved.SetValue allows growing arrays up to arbitrary sizes in crossplane-runtime
Summary
Fuzz testing on crossplane/crossplane, by Ada Logics and sponsored by the CNCF, identified input to a function in the fieldpath package that can cause an out of memory panic. Applications that use the Paved type’s SetValue method with user provided input without proper validation might use excessive amounts of memory and cause an out of memory panic.
Details
In the fieldpath package, the SetValue method of the Paved type sets a value on the inner object according to the provided path, without validating it first. This allows setting values in slices at any specific index and the code will grow the target array up to the required size. The index is currently capped at max uint32 (4294967295) given how indexes are parsed, but that is still an unnecessarily large value.
Workaround
Users can parse and validate the path before passing it to the SetValue method of the Paved type, constraining the index size as deemed appropriate.
Credits
Disclosed by Ada Logics in a fuzzing audit sponsored by CNCF.
Package
gomod github.com/crossplane/crossplane-runtime (Go)
Affected versions
>= 0.17.0, < 0.19.2
< 0.16.1
Patched versions
0.19.2
0.16.1
Summary
Fuzz testing on crossplane/crossplane, by Ada Logics and sponsored by the CNCF, identified input to a function in the fieldpath package that can cause an out of memory panic. Applications that use the Paved type’s SetValue method with user provided input without proper validation might use excessive amounts of memory and cause an out of memory panic.
Details
In the fieldpath package, the SetValue method of the Paved type sets a value on the inner object according to the provided path, without validating it first. This allows setting values in slices at any specific index and the code will grow the target array up to the required size. The index is currently capped at max uint32 (4294967295) given how indexes are parsed, but that is still an unnecessarily large value.
Workaround
Users can parse and validate the path before passing it to the SetValue method of the Paved type, constraining the index size as deemed appropriate.
Credits
Disclosed by Ada Logics in a fuzzing audit sponsored by CNCF.
References
- GHSA-vfvj-3m3g-m532
- https://nvd.nist.gov/vuln/detail/CVE-2023-27483
- crossplane/crossplane-runtime@53508a9
Published by the National Vulnerability Database
Mar 9, 2023
Published to the GitHub Advisory Database
Mar 13, 2023
Last updated
Mar 13, 2023
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crossplane-runtime is a set of go libraries used to build Kubernetes controllers in Crossplane and its related stacks. An out of memory panic vulnerability has been discovered in affected versions. Applications that use the `Paved` type's `SetValue` method with user provided input without proper validation might use excessive amounts of memory and cause an out of memory panic. In the fieldpath package, the Paved.SetValue method sets a value on the Paved object according to the provided path, without any validation. This allows setting values in slices at any provided index, which grows the target array up to the requested index, the index is currently capped at max uint32 (4294967295) given how indexes are parsed, but that is still an unnecessarily large value. If callers are not validating paths' indexes on their own, which most probably are not going to do, given that the input is parsed directly in the SetValue method, this could allow users to consume arbitrary amounts of memory. A...