Vulnerabilities in pkg:nuget/curl

PACKAGE

Advisory Identifier: GHSA-674j-7m97-j2p9

Advisory Summary

CVE-2018-1000120 is a CRITICAL (CVSS 9.8) curl ftp path confusion leads vulnerability (CWE-787: Out-of-bounds Write) affecting Curl libraries in the NuGet ecosystem. The issue involves curl ftp path confusion leads to nil byte out of bounds write. Remediation is available in the latest vendor maintenance releases.

1 Known Advisory Record(s)

Package Vulnerability Intelligence

pkg:nuget/curl

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:nuget/curl. Select an advisory below to view technical details or fixes.

Advisory ID	CVE / NVD	Severity	Summary
GHSA-674j-7m97-j2p9	CVE-2018-1000120	CRITICAL	curl FTP path confusion leads to NIL byte out of bounds write

CVE-2018-1000120 at a Glance

CVE Identifier CVE-2018-1000120

GHSA Identifier GHSA-674j-7m97-j2p9

Severity CRITICAL

CVSS v3.1 Base Score 9.8

CWE Classification CWE-787: Out-of-bounds Write

Affected Product Curl

Package Ecosystem NuGet

Published Date 2022-05-14

Last Updated 2023-03-01

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required None (PR:N)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality High (C:H)

Integrity High (I:H)

Availability High (A:H)

How to Fix CVE-2018-1000120

To remediate this vulnerability, upgrade all affected Curl dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

curl fixed: Latest secure release

Upgrade curl to Latest secure release

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

inspect dependencies for curl

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-1000120, inspect your project dependencies for Curl:

inspect dependencies for curl

Analyze the terminal output to locate any version of Curl in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-787: Out-of-bounds Write, where the product writes data past the end, or before the beginning, of the intended buffer. In Curl, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

curl can be coerced into writing a zero byte out of bounds. This bug can trigger when curl is told to work on an FTP URL, with the setting to only issue a single CWD command (--ftp-method singlecwd or the libcurl alternative [CURLOPT_FTP_FILEMETHOD](https://curl.se/libcurl/c/CURLOPT_FTP_FILEMETHOD.html)). curl then URL-decodes the given path, calls strlen() on the result and deducts the length of the file name part to find the end of the directory within the buffer. It then writes a zero byte on that index, in a buffer allocated on the heap. If the directory part of the URL contains a `%00` sequence, the directory length might end up shorter than the file name path, making the calculation `size_t index = directory_len - filepart_len` end up with a huge index variable for where the zero byte gets stored: `heap_buffer[index] = 0`. On several architectures that huge index will wrap and work as a negative value, thus overwriting memory before the intended heap buffer. By using different file part lengths and putting the string `%00` in different places in the URL, an attacker that can control what paths a curl-using application uses can write that zero byte on different indexes.

CVE-2018-1000120 Affected Curl Versions

1 component(s)

Product / Package	Ecosystem	Affected Versions	Fixed Version
curl nuget/curl	NuGet	≥ 7.12.3

References

NVD — CVE-2018-1000120 NVD

https://nvd.nist.gov/vuln/detail/CVE-2018-1000120

Curl Security Information SECURITY

https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html

Curl Security Information SECURITY

https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html

Curl Security Information SECURITY

https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html

Curl Security Information SECURITY

https://www.debian.org/security/2018/dsa-4136

Curl Security Information SECURITY

https://web.archive.org/web/20201220134609/http://www.securityfocus.com/bid/103414

Curl Security Information SECURITY

https://web.archive.org/web/20201220134105/http://www.securitytracker.com/id/1040531

usn.ubuntu.com/3598-2 WEB

https://usn.ubuntu.com/3598-2

usn.ubuntu.com/3598-1 WEB

https://usn.ubuntu.com/3598-1

lists.debian.org/debian-lts-announce... WEB

https://lists.debian.org/debian-lts-announce/2018/03/msg00012.html

Curl Source Repository REPOSITORY

https://github.com/coapp-packages/curl

Curl Security Information SECURITY

https://curl.se/docs/CVE-2018-1000120.html

Curl Security Information SECURITY

https://curl.haxx.se/docs/adv_2018-9cd6.html

access.redhat.com/errata/rhsa-2020:05... WEB

https://access.redhat.com/errata/RHSA-2020:0594

access.redhat.com/errata/rhsa-2020:05... WEB

https://access.redhat.com/errata/RHSA-2020:0544

access.redhat.com/errata/rhsa-2019:15... WEB

https://access.redhat.com/errata/RHSA-2019:1543

access.redhat.com/errata/rhsa-2018:35... WEB

https://access.redhat.com/errata/RHSA-2018:3558

access.redhat.com/errata/rhsa-2018:31... WEB

https://access.redhat.com/errata/RHSA-2018:3157

access.redhat.com/errata/rhba-2019:03... WEB

https://access.redhat.com/errata/RHBA-2019:0327

Curl Security Information SECURITY

http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html

Curl Security Information SECURITY

http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html

Frequently Asked Questions

What is CVE-2018-1000120?

CVE-2018-1000120 is a security vulnerability in Curl involving curl FTP path confusion leads to NIL byte out of bounds write under CWE-787: Out-of-bounds Write.

Which Curl versions are affected?

Affected versions include releases prior to current release patches across affected packages: curl.

What version fixes CVE-2018-1000120?

Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.

Is curl affected?

Yes, curl is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.

What is the CVSS score of CVE-2018-1000120?

CVE-2018-1000120 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

What CWE is associated with CVE-2018-1000120?

CVE-2018-1000120 is classified under CWE-787: Out-of-bounds Write (The product writes data past the end, or before the beginning, of the intended buffer.).

How can I check NuGet dependencies for CVE-2018-1000120?

Run the dependency tree command: 'inspect dependencies for curl'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-674j-7m97-j2p9",
  "modified" : "2023-03-01T22:23:11Z",
  "published" : "2022-05-14T00:58:02Z",
  "aliases" : [ "CVE-2018-1000120" ],
  "summary" : "curl FTP path confusion leads to NIL byte out of bounds write",
  "details" : "curl can be coerced into writing a zero byte out of bounds.\n\nThis bug can trigger when curl is told to work on an FTP URL, with the setting to only issue a single CWD command (--ftp-method singlecwd or the libcurl alternative [CURLOPT_FTP_FILEMETHOD](https://curl.se/libcurl/c/CURLOPT_FTP_FILEMETHOD.html)).\n\ncurl then URL-decodes the given path, calls strlen() on the result and deducts the length of the file name part to find the end of the directory within the buffer. It then writes a zero byte on that index, in a buffer allocated on the heap.\n\nIf the directory part of the URL contains a `%00` sequence, the directory length might end up shorter than the file name path, making the calculation `size_t index = directory_len - filepart_len` end up with a huge index variable for where the zero byte gets stored: `heap_buffer[index] = 0`. On several architectures that huge index will wrap and work as a negative value, thus overwriting memory before the intended heap buffer.\n\nBy using different file part lengths and putting the string `%00` in different places in the URL, an attacker that can control what paths a curl-using application uses can write that zero byte on different indexes.\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "curl"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.12.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "< 7.59.0"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-1000120"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html"
  }, {
    "type" : "WEB",
    "url" : "https://www.debian.org/security/2018/dsa-4136"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20201220134609/http://www.securityfocus.com/bid/103414"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20201220134105/http://www.securitytracker.com/id/1040531"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/3598-2"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/3598-1"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2018/03/msg00012.html"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/coapp-packages/curl"
  }, {
    "type" : "WEB",
    "url" : "https://curl.se/docs/CVE-2018-1000120.html"
  }, {
    "type" : "WEB",
    "url" : "https://curl.haxx.se/docs/adv_2018-9cd6.html"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2020:0594"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2020:0544"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:1543"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3558"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3157"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHBA-2019:0327"
  }, {
    "type" : "WEB",
    "url" : "http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-787" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-03-01T22:23:11Z",
    "nvd_published_at" : "2018-03-14T18:29:00Z"
  }
}

CVSS V3

9.8 CRITICAL

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required None (PR:N)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality High (C:H)

Integrity High (I:H)

Availability High (A:H)

Vector String

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Advisory Metadata

Source ID: GHSA-674j-7m97-j2p9
Schema Version: 1.4.0
Published: 2022-05-14 00:58
Last Modified: 2023-03-01 22:23
Database Record File: advisories/github-reviewed/2022/05/GHSA-674j-7m97-j2p9/GHSA-674j-7m97-j2p9.json