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Denial of service via HAMT Decoding Panics

Moderate severity GitHub Reviewed Published Feb 9, 2023 in ipfs/go-unixfs • Updated Jun 13, 2023

Package

gomod github.com/ipfs/go-unixfs (Go)

Affected versions

< 0.4.3

Patched versions

0.4.3

Description

Impact

Trying to read malformed HAMT sharded directories can cause panics and virtual memory leaks.
If you are reading untrusted user input, an attacker can then trigger a panic.

This is caused by bogus fanout parameter in the HAMT directory nodes.
This include checks returned in ipfs/go-bitfield GHSA-2h6c-j3gf-xp9r, as well as limiting the fanout to <= 1024 (to avoid attempts of arbitrary sized allocations).

Patches

Workarounds

Do not feed untrusted user data to the decoding functions.

References

References

@Jorropo Jorropo published to ipfs/go-unixfs Feb 9, 2023
Published by the National Vulnerability Database Feb 9, 2023
Published to the GitHub Advisory Database Feb 10, 2023
Reviewed Feb 10, 2023
Last updated Jun 13, 2023

Severity

Moderate
5.9
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

CVE ID

CVE-2023-23625

GHSA ID

GHSA-q264-w97q-q778

Source code

Credits

Checking history
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