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ipld/go-codec-dagpb panics when processing certain blocks

High severity GitHub Reviewed Published Apr 8, 2022 in ipld/go-codec-dagpb • Updated Aug 30, 2023

Package

gomod github.com/ipld/go-codec-dagpb (Go)

Affected versions

< 1.3.1

Patched versions

1.3.1

Description

Impact

Decoding certain blocks using the go-ipld-prime version of the dag-pb codec (go-codec-dagpb) can cause a panic. The panic comes from an assumption that the reported link length is accurate, but if the block ends before that reported length then it’s a buffer overread.

Patches

The issue is fixed in v1.3.1 and above.

Consumers can discover the versions of go-codec-dagpb in a module's dependency graph using the following command in the module root:

go mod graph | grep go-codec-dagpb

Workarounds

You can work around this issue without upgrading by recovering panics higher in the call stack of the goroutine that calls the defective code.

For more information

If you have any questions or comments about this advisory:

References

@guseggert guseggert published to ipld/go-codec-dagpb Apr 8, 2022
Published to the GitHub Advisory Database Apr 8, 2022
Reviewed Apr 8, 2022
Last updated Aug 30, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

CVE ID

No known CVE

GHSA ID

GHSA-g3vv-g2j5-45f2

Source code

github.com/ipld/go-codec-dagpb
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