CURL-CVE-2023-27534

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Source

https://curl.se/docs/CVE-2023-27534.html

Import Source

https://curl.se/docs/CURL-CVE-2023-27534.json

JSON Data

https://api.test.osv.dev/v1/vulns/CURL-CVE-2023-27534

Aliases

CVE-2023-27534

Published

2023-03-20T08:00:00Z

Modified

2024-01-16T03:42:50.338439Z

Summary

SFTP path ~ resolving discrepancy

Details

curl supports SFTP transfers. curl's SFTP implementation offers a special feature in the path component of URLs: a tilde (~) character as the first path element in the path to denotes a path relative to the user's home directory. This is supported because of wording in the once proposed to-become RFC draft that was to dictate how SFTP URLs work.

Due to a bug, the handling of the tilde in SFTP path did however not only replace it when it is used stand-alone as the first path element but also wrongly when used as a mere prefix in the first element.

Using a path like /~2/foo when accessing a server using the user dan (with home directory /home/dan) would then quite surprisingly access the file /home/dan2/foo.

This can be taken advantage of to circumvent filtering or worse.

Database specific

{
    "issue": "https://hackerone.com/reports/1892351",
    "URL": "https://curl.se/docs/CVE-2023-27534.json",
    "last_affected": "7.88.1",
    "affects": "both",
    "award": {
        "currency": "USD",
        "amount": "480"
    },
    "CWE": {
        "desc": "Improper Limitation of a Pathname to a Restricted Directory",
        "id": "CWE-22"
    },
    "severity": "Low",
    "package": "curl",
    "www": "https://curl.se/docs/CVE-2023-27534.html"
}

References

Credits

- Harry Sintonen - FINDER
- Daniel Stenberg - REMEDIATION_DEVELOPER

Affected packages

Git / github.com/curl/curl.git

Affected ranges

Type: SEMVER
Events: Introduced

7.18.0

Fixed

8.0.0

Type: GIT
Repo: https://github.com/curl/curl.git
Events: Introduced

ba6f20a2442ab1ebfe947cff19a552f92114a29a

Fixed

4e2b52b5f7a3bf50a0f1494155717b02cc1df6d6

Affected versions

7.*

7.18.0

7.18.1

7.18.2

7.19.0

7.19.1

7.19.2

7.19.3

7.19.4

7.19.5

7.19.6

7.19.7

7.20.0

7.20.1

7.21.0

7.21.1

7.21.2

7.21.3

7.21.4

7.21.5

7.21.6

7.21.7

7.22.0

7.23.0

7.23.1

7.24.0

7.25.0

7.26.0

7.27.0

7.28.0

7.28.1

7.29.0

7.30.0

7.31.0

7.32.0

7.33.0

7.34.0

7.35.0

7.36.0

7.37.0

7.37.1

7.38.0

7.39.0

7.40.0

7.41.0

7.42.0

7.42.1

7.43.0

7.44.0

7.45.0

7.46.0

7.47.0

7.47.1

7.48.0

7.49.0

7.49.1

7.50.0

7.50.1

7.50.2

7.50.3

7.51.0

7.52.0

7.52.1

7.53.0

7.53.1

7.54.0

7.54.1

7.55.0

7.55.1

7.56.0

7.56.1

7.57.0

7.58.0

7.59.0

7.60.0

7.61.0

7.61.1

7.62.0

7.63.0

7.64.0

7.64.1

7.65.0

7.65.1

7.65.2

7.65.3

7.66.0

7.67.0

7.68.0

7.69.0

7.69.1

7.70.0

7.71.0

7.71.1

7.72.0

7.73.0

7.74.0

7.75.0

7.76.0

7.76.1

7.77.0

7.78.0

7.79.0

7.79.1

7.80.0

7.81.0

7.82.0

7.83.0

7.83.1

7.84.0

7.85.0

7.86.0

7.87.0

7.88.0

7.88.1

Database specific

{
    "vanir_signatures": [
        {
            "signature_type": "Function",
            "target": {
                "file": "lib/curl_path.c",
                "function": "Curl_getworkingpath"
            },
            "signature_version": "v1",
            "digest": {
                "length": 1162.0,
                "function_hash": "228840074135554431436719030323093654179"
            },
            "source": "https://github.com/curl/curl.git/commit/4e2b52b5f7a3bf50a0f1494155717b02cc1df6d6",
            "deprecated": false,
            "id": "CURL-CVE-2023-27534-41b9bc57"
        },
        {
            "signature_type": "Line",
            "target": {
                "file": "lib/curl_path.c"
            },
            "signature_version": "v1",
            "digest": {
                "threshold": 0.9,
                "line_hashes": [
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                    "17595090113948442442737404369813994168",
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                    "139300319062665313356507615483743702008",
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                    "192553860508771460009008025076551363558",
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                    "122444487809622759736426500349637244536",
                    "249625537427663162852917849078719393486",
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                    "251350689102973709440522639738416094059",
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                    "101898109192932712250706491865800012857",
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                    "180519442735749124854477651929287477130",
                    "10843707057582894148002426623887554465",
                    "310397967457063354526099098088053995188",
                    "143856960950009739223417370161638863001",
                    "227832957307795953550157382558438178924",
                    "164919229496897240624069036802370089344",
                    "334030817854875047914307532863676427973",
                    "20925765012834045928219785870668575700",
                    "64191071328762438076287199822580165471",
                    "336973117671902481458599763111284669984",
                    "153999460614051797763374948783717851513",
                    "139300319062665313356507615483743702008",
                    "173293223730354422723121247930875265019",
                    "332980443351317171627524081174027457346",
                    "172614800569243312121640488635040898424",
                    "222352064344804085798479313409624286993",
                    "252970910987515919464260785484673287410",
                    "140728092908624700123691564267460159843",
                    "98216406554028246372000676043079968592",
                    "109458180892148882097022975793511679746",
                    "236511837109245670155669349537673282164"
                ]
            },
            "source": "https://github.com/curl/curl.git/commit/4e2b52b5f7a3bf50a0f1494155717b02cc1df6d6",
            "deprecated": false,
            "id": "CURL-CVE-2023-27534-4c227131"
        }
    ]
}