CVE-2021-40524

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Source
https://cve.org/CVERecord?id=CVE-2021-40524
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-40524.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-40524
Downstream
Related
Published
2021-09-05T19:15:15.080Z
Modified
2026-03-14T11:11:06.211069Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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
868f0e2277e3f5890ca08c84d41de8065a7d8bc3
Fixed
37ad222868e52271905b94afea4fc780d83294b4
Database specific 
{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.0.50"
        }
    ]
}

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

unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "1.0.23"
            },
            {
                "fixed": "1.0.50"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "1.0.23"
            },
            {
                "last_affected": "1.0.49"
            }
        ]
    }
]
vanir_signatures 
[
    {
        "signature_type": "Line",
        "deprecated": false,
        "id": "CVE-2021-40524-00e4d04c",
        "target": {
            "file": "src/simpleconf_ftpd.h"
        },
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "62861421324718626283205813091113225033",
                "276556215880805753523756337752274567287",
                "139825961526930270406704652117385392827"
            ]
        },
        "signature_version": "v1",
        "source": "https://github.com/jedisct1/pure-ftpd/commit/868f0e2277e3f5890ca08c84d41de8065a7d8bc3"
    },
    {
        "signature_type": "Line",
        "deprecated": false,
        "id": "CVE-2021-40524-178db787",
        "target": {
            "file": "src/ftpd.c"
        },
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "143088216645301880473965997968294163065",
                "268607288337989793077162423436249802443",
                "280366719401112403696117270706084821257",
                "25497428101258363206954973861780601325",
                "122625483517188019176324232254541051564"
            ]
        },
        "signature_version": "v1",
        "source": "https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4"
    },
    {
        "signature_type": "Function",
        "deprecated": false,
        "id": "CVE-2021-40524-1865d9b9",
        "target": {
            "file": "src/ftpd.c",
            "function": "dostor"
        },
        "digest": {
            "length": 5664.0,
            "function_hash": "310052781692296683813829170466513134176"
        },
        "signature_version": "v1",
        "source": "https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4"
    },
    {
        "signature_type": "Line",
        "deprecated": false,
        "id": "CVE-2021-40524-4d96a6cc",
        "target": {
            "file": "src/ftpd.c"
        },
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "327613222484680267523609399946935356801",
                "64578520351811071438175404995853636934",
                "334874348702182263595910484650313300601",
                "55911490789187075424799755591925651998",
                "70197884628312536342180718915065003616",
                "5617403673146396898843751981405312363",
                "242650641383625547911307232728864617038",
                "77025422434488939853243591243294715107",
                "58890166137011872160805173120156300682",
                "96871755512210542170053570303506689476",
                "274654776397210090945500021649092363083",
                "69649565509962129596219163301725269085"
            ]
        },
        "signature_version": "v1",
        "source": "https://github.com/jedisct1/pure-ftpd/commit/868f0e2277e3f5890ca08c84d41de8065a7d8bc3"
    },
    {
        "signature_type": "Function",
        "deprecated": false,
        "id": "CVE-2021-40524-bdd51916",
        "target": {
            "file": "src/ftpd.c",
            "function": "pureftpd_start"
        },
        "digest": {
            "length": 14818.0,
            "function_hash": "37089621735897002683250435944003137392"
        },
        "signature_version": "v1",
        "source": "https://github.com/jedisct1/pure-ftpd/commit/868f0e2277e3f5890ca08c84d41de8065a7d8bc3"
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-40524.json"