CVE-2021-21401

Nanopb is a small code-size Protocol Buffers implementation in ansi C. In Nanopb before versions 0.3.9.8 and 0.4.5, decoding a specifically formed message can cause invalid free() or realloc() calls if the message type contains an oneof field, and the oneof directly contains both a pointer field and a non-pointer field. If the message data first contains the non-pointer field and then the pointer field, the data of the non-pointer field is incorrectly treated as if it was a pointer value. Such message data rarely occurs in normal messages, but it is a concern when untrusted data is parsed. This has been fixed in versions 0.3.9.8 and 0.4.5. See referenced GitHub Security Advisory for more information including workarounds.

References

Affected packages

Git / github.com/nanopb/nanopb

Affected ranges

Type: GIT
Repo: https://github.com/nanopb/nanopb
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

e2f0ccf939d9f82931d085acb6df8e9a182a4261

Introduced

c29ca83ff47a7224172a74ccfee07d91fa040e4c

Fixed

c9124132a604047d0ef97a09c0e99cd9bed2c818

Affected versions

0.*

0.4.0

0.4.1

0.4.2

0.4.3

0.4.4

nanopb-0.*

nanopb-0.4.0

nanopb-0.4.0-dev

nanopb-0.4.1

nanopb-0.4.2

nanopb-0.4.3

nanopb-0.4.4

Database specific

vanir_signatures

[
    {
        "id": "CVE-2021-21401-1bc41359",
        "signature_version": "v1",
        "digest": {
            "function_hash": "135569156852612219065699278227514311302",
            "length": 325.0
        },
        "deprecated": false,
        "source": "https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261",
        "signature_type": "Function",
        "target": {
            "file": "pb_decode.c",
            "function": "pb_release_union_field"
        }
    },
    {
        "id": "CVE-2021-21401-ba7b2709",
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "61013708987579731352987091476408286170",
                "327087506916403461653276454963703349803",
                "44894250810108914257220512929796472898"
            ]
        },
        "deprecated": false,
        "source": "https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261",
        "signature_type": "Line",
        "target": {
            "file": "pb_decode.c"
        }
    }
]

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21401.json"