CVE-2021-40524

In Pure-FTPd before 1.0.50, an incorrect max_filesize quota mechanism in the server allows attackers to upload files of unbounded size, which may lead to denial of service or a server hang. This occurs because a certain greater-than-zero test does not anticipate an initial -1 value. (Versions 1.0.23 through 1.0.49 are affected.)

References

Affected packages

Git / github.com/jedisct1/pure-ftpd

Affected ranges

Type: GIT
Repo: https://github.com/jedisct1/pure-ftpd
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

37ad222868e52271905b94afea4fc780d83294b4

Affected versions

1.*

1.0.33

1.0.34

1.0.35

1.0.36

1.0.37

1.0.38

1.0.39

1.0.40

1.0.41

1.0.42

1.0.43

1.0.44

1.0.45

1.0.46

1.0.47

1.0.48

1.0.49

Database specific

vanir_signatures

[
    {
        "signature_type": "Line",
        "id": "CVE-2021-40524-178db787",
        "source": "https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4",
        "signature_version": "v1",
        "target": {
            "file": "src/ftpd.c"
        },
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "143088216645301880473965997968294163065",
                "268607288337989793077162423436249802443",
                "280366719401112403696117270706084821257",
                "25497428101258363206954973861780601325",
                "122625483517188019176324232254541051564"
            ]
        },
        "deprecated": false
    },
    {
        "signature_type": "Function",
        "id": "CVE-2021-40524-1865d9b9",
        "source": "https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4",
        "signature_version": "v1",
        "target": {
            "function": "dostor",
            "file": "src/ftpd.c"
        },
        "digest": {
            "function_hash": "310052781692296683813829170466513134176",
            "length": 5664.0
        },
        "deprecated": false
    }
]