CURL-CVE-2018-14618

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Source
https://curl.se/docs/CVE-2018-14618.html
Import Source
https://curl.se/docs/CURL-CVE-2018-14618.json
JSON Data
https://api.osv.dev/v1/vulns/CURL-CVE-2018-14618
Aliases
Published
2018-09-05T08:00:00Z
Modified
2026-05-27T02:29:22.732742Z
Summary
NTLM password overflow via integer overflow
Details

libcurl contains a buffer overrun in the NTLM authentication code.

The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap.

The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32-bit size_t, the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a tiny buffer to actually get allocated instead of the intended huge one, making the use of that buffer end up in a heap buffer overflow.

(This bug is almost identical to CVE-2017-8816.)

Database specific 
{
    "severity": "High",
    "www": "https://curl.se/docs/CVE-2018-14618.html",
    "CWE": {
        "id": "CWE-131",
        "desc": "Incorrect Calculation of Buffer Size"
    },
    "URL": "https://curl.se/docs/CVE-2018-14618.json",
    "affects": "both",
    "package": "curl",
    "last_affected": "7.61.0"
}
References
Credits
    • Zhaoyang Wu - FINDER
    • Daniel Stenberg - REMEDIATION_DEVELOPER

Affected packages

Git / github.com/curl/curl.git

Affected ranges

Type
SEMVER
Events
Introduced
7.15.4
Fixed
7.61.1
Type
GIT
Repo
https://github.com/curl/curl.git
Events
Introduced
be285cde3f52571087816759220a68cb994d9307
Fixed
57d299a499155d4b327e341c6024e293b0418243

Affected versions

7.*
7.15.4
7.15.5
7.16.0
7.16.1
7.16.2
7.16.3
7.16.4
7.17.0
7.17.1
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
Other
curl-7_15_4
curl-7_15_5
curl-7_15_6-prepipeline
curl-7_16_0
curl-7_16_1
curl-7_16_2
curl-7_16_3
curl-7_16_4
curl-7_17_0
curl-7_17_0-preldapfix
curl-7_17_1
curl-7_18_0
curl-7_18_1
curl-7_18_2
curl-7_19_0
curl-7_19_1
curl-7_19_2
curl-7_19_3
curl-7_19_4
curl-7_19_5
curl-7_19_6
curl-7_19_7
curl-7_20_0
curl-7_20_1
curl-7_21_0
curl-7_21_1
curl-7_21_2
curl-7_21_3
curl-7_21_4
curl-7_21_5
curl-7_21_6
curl-7_21_7
curl-7_22_0
curl-7_23_0
curl-7_23_1
curl-7_24_0
curl-7_25_0
curl-7_26_0
curl-7_27_0
curl-7_28_0
curl-7_28_1
curl-7_29_0
curl-7_30_0
curl-7_31_0
curl-7_32_0
curl-7_33_0
curl-7_34_0
curl-7_35_0
curl-7_36_0
curl-7_37_0
curl-7_37_1
curl-7_38_0
curl-7_39_0
curl-7_40_0
curl-7_41_0
curl-7_42_0
curl-7_42_1
curl-7_43_0
curl-7_44_0
curl-7_45_0
curl-7_46_0
curl-7_47_0
curl-7_47_1
curl-7_48_0
curl-7_49_0
curl-7_49_1
curl-7_50_0
curl-7_50_1
curl-7_50_2
curl-7_50_3
curl-7_51_0
curl-7_52_0
curl-7_52_1
curl-7_53_0
curl-7_53_1
curl-7_54_0
curl-7_54_1
curl-7_55_0
curl-7_55_1
curl-7_56_0
curl-7_56_1
curl-7_57_0
curl-7_58_0
curl-7_59_0
curl-7_60_0
curl-7_61_0

Database specific

source 
"https://curl.se/docs/CURL-CVE-2018-14618.json"
vanir_signatures_modified 
"2026-05-27T02:29:22Z"
vanir_signatures 
[
    {
        "signature_version": "v1",
        "signature_type": "Line",
        "source": "https://github.com/curl/curl.git/commit/57d299a499155d4b327e341c6024e293b0418243",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "308639007250509123190976279093395161667",
                "22425808840478996378096397749848053213",
                "180330362882211631427711985805115613750",
                "169213246600422826387397555860516277626",
                "71393262281816378382005532163113147318"
            ]
        },
        "id": "CURL-CVE-2018-14618-98a98d12",
        "deprecated": false,
        "target": {
            "file": "lib/curl_ntlm_core.c"
        }
    },
    {
        "signature_version": "v1",
        "signature_type": "Function",
        "source": "https://github.com/curl/curl.git/commit/57d299a499155d4b327e341c6024e293b0418243",
        "digest": {
            "function_hash": "218596901524376433772706707277383241298",
            "length": 1784.0
        },
        "id": "CURL-CVE-2018-14618-b9807594",
        "deprecated": false,
        "target": {
            "file": "lib/curl_ntlm_core.c",
            "function": "Curl_ntlm_core_mk_nt_hash"
        }
    }
]