Common Weakness Enumeration

CWE-59

Allowed

Improper Link Resolution Before File Access ('Link Following')

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

1990 vulnerabilities reference this CWE, most recent first.

CVE-2017-7500 (GCVE-0-2017-7500)

Vulnerability from cvelistv5 – Published: 2018-08-13 17:00 – Updated: 2024-08-05 16:04
VLAI
Summary
It was found that rpm did not properly handle RPM installations when a destination path was a symbolic link to a directory, possibly changing ownership and permissions of an arbitrary directory, and RPM files being placed in an arbitrary destination. An attacker, with write access to a directory in which a subdirectory will be installed, could redirect that directory to an arbitrary location and gain root privilege.
Severity
7.3 (High)
CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
[UNKNOWN] rpm Affected: 4.13.0.2
Affected: 4.14.0
Create a notification for this product.
Date Public
2017-07-03 00:00
Show details on NVD website
To clipboard 

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CVE-2016-9602 (GCVE-0-2016-9602)

Vulnerability from cvelistv5 – Published: 2018-04-26 19:00 – Updated: 2024-08-06 02:59
VLAI
Summary
Qemu before version 2.9 is vulnerable to an improper link following when built with the VirtFS. A privileged user inside guest could use this flaw to access host file system beyond the shared folder and potentially escalating their privileges on a host.
Severity
7.6 (High)
CVSS:3.0/AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
unspecified Qemu Affected: qemu 2.9
Create a notification for this product.
Date Public
2017-01-17 00:00
Show details on NVD website
To clipboard 

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CVE-2016-8641 (GCVE-0-2016-8641)

Vulnerability from cvelistv5 – Published: 2018-08-01 14:00 – Updated: 2024-08-06 02:27
VLAI
Summary
A privilege escalation vulnerability was found in nagios 4.2.x that occurs in daemon-init.in when creating necessary files and insecurely changing the ownership afterwards. It's possible for the local attacker to create symbolic links before the files are to be created and possibly escalating the privileges with the ownership change.
Severity
6.7 (Medium)
CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Date Public
2016-11-22 00:00
Show details on NVD website
To clipboard 

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CVE-2014-1420 (GCVE-0-2014-1420)

Vulnerability from cvelistv5 – Published: 2020-09-10 23:55 – Updated: 2024-09-16 17:08
VLAI
Title
Insecure temp file usage in Ubuntu UI toolkit
Summary
On desktop, Ubuntu UI Toolkit's StateSaver would serialise data on tmp/ files which an attacker could use to expose potentially sensitive data. StateSaver would also open files without the O_EXCL flag. An attacker could exploit this to launch a symlink attack, though this is partially mitigated by symlink and hardlink restrictions in Ubuntu. Fixed in 1.1.1188+14.10.20140813.4-0ubuntu1.
Severity
3.8 (Low)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
CWE
  • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
URL Tags
https://launchpad.net/bugs/1348241 vendor-advisoryx_refsource_UBUNTU
http://bazaar.launchpad.net/~ubuntu-sdk-team/ubun… vendor-advisoryx_refsource_UBUNTU
Impacted products
Vendor Product Version
Canonical ubuntu-ui-toolkit Affected: 1.1.1188 , < 1.1.1188+14.10.20140813.4-0ubuntu1 (custom)
Create a notification for this product.
Date Public
2014-07-24 00:00
Credits
Olivier Tilloy
Show details on NVD website
To clipboard 

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CVE-2013-0261 (GCVE-0-2013-0261)

Vulnerability from cvelistv5 – Published: 2013-03-08 21:00 – Updated: 2026-04-30 16:33
VLAI
Title
Packstack: packstack: arbitrary file overwrite via symlink attack
Summary
A flaw was found in PackStack. A local user could exploit a symlink attack on a temporary file with a predictable name in the `/tmp` directory. This vulnerability allows the local user to overwrite arbitrary files on the system, potentially leading to system compromise or data corruption.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE
  • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
Impacted products
Date Public
2013-03-08 21:00
Show details on NVD website
To clipboard 

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GHSA-225J-HMP8-XWWV

Vulnerability from github – Published: 2022-05-17 05:01 – Updated: 2022-05-17 05:01
VLAI
Details

A certain Debian patch for txt2man 1.5.5, as used in txt2man 1.5.5-2, 1.5.5-4, and others, allows local users to overwrite arbitrary files via a symlink attack on /tmp/2222.

Show details on source website
To clipboard 

{
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  "aliases": [
    "CVE-2013-1444"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-59"
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  "id": "GHSA-225j-hmp8-xwwv",
  "modified": "2022-05-17T05:01:49Z",
  "published": "2022-05-17T05:01:49Z",
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    },
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      "type": "WEB",
      "url": "http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=724614"
    },
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      "type": "WEB",
      "url": "http://osvdb.org/97769"
    },
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    },
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GHSA-22MX-2PF3-V75R

Vulnerability from github – Published: 2022-05-24 17:11 – Updated: 2022-05-24 17:11
VLAI
Details

Docker Desktop allows local privilege escalation to NT AUTHORITY\SYSTEM because it mishandles the collection of diagnostics with Administrator privileges, leading to arbitrary DACL permissions overwrites and arbitrary file writes. This affects Docker Desktop Enterprise before 2.1.0.9, Docker Desktop for Windows Stable before 2.2.0.4, and Docker Desktop for Windows Edge before 2.2.2.0.

Severity
6.7 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

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  "aliases": [
    "CVE-2020-10665"
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    "cwe_ids": [
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    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-03-18T19:15:00Z",
    "severity": "HIGH"
  },
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  "modified": "2022-05-24T17:11:49Z",
  "published": "2022-05-24T17:11:49Z",
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    },
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      "url": "https://docs.docker.com/release-notes"
    },
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      "url": "https://github.com/active-labs/Advisories/blob/master/2020/ACTIVE-2020-002.md"
    },
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      "url": "https://github.com/spaceraccoon/CVE-2020-10665"
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GHSA-2357-M5J6-6JV3

Vulnerability from github – Published: 2022-05-14 00:54 – Updated: 2022-05-14 00:54
VLAI
Details

keepalived 2.0.8 didn't check for pathnames with symlinks when writing data to a temporary file upon a call to PrintData or PrintStats. This allowed local users to overwrite arbitrary files if fs.protected_symlinks is set to 0, as demonstrated by a symlink from /tmp/keepalived.data or /tmp/keepalived.stats to /etc/passwd.

Severity
4.7 (Medium)
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Show details on source website
To clipboard 

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  "aliases": [
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  ],
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    "github_reviewed_at": null,
    "nvd_published_at": "2018-11-08T20:29:00Z",
    "severity": "MODERATE"
  },
  "details": "keepalived 2.0.8 didn\u0027t check for pathnames with symlinks when writing data to a temporary file upon a call to PrintData or PrintStats. This allowed local users to overwrite arbitrary files if fs.protected_symlinks is set to 0, as demonstrated by a symlink from /tmp/keepalived.data or /tmp/keepalived.stats to /etc/passwd.",
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      "url": "https://github.com/acassen/keepalived/issues/1048"
    },
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      "url": "https://github.com/acassen/keepalived/commit/04f2d32871bb3b11d7dc024039952f2fe2750306"
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      "type": "WEB",
      "url": "https://bugzilla.suse.com/show_bug.cgi?id=1015141"
    },
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      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/201903-01"
    }
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GHSA-2367-C296-3MP2

Vulnerability from github – Published: 2021-08-25 20:43 – Updated: 2023-06-13 21:53
VLAI
Summary
Arbitrary file overwrite in tar-rs
Details

When unpacking a tarball with the unpack_in-family of functions it's intended that only files within the specified directory are able to be written. Tarballs with hard links or symlinks, however, can be used to overwrite any file on the filesystem. Tarballs can contain multiple entries for the same file. A tarball which first contains an entry for a hard link or symlink pointing to any file on the filesystem will have the link created, and then afterwards if the same file is listed in the tarball the hard link will be rewritten and any file can be rewritten on the filesystem.

Severity
7.5 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Show details on source website
To clipboard 

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      },
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        {
          "events": [
            {
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        }
      ]
    }
  ],
  "aliases": [
    "CVE-2018-20990"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-59"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-08-19T21:24:12Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "When unpacking a tarball with the unpack_in-family of functions it\u0027s intended that only files within the specified directory are able to be written. Tarballs with hard links or symlinks, however, can be used to overwrite any file on the filesystem. Tarballs can contain multiple entries for the same file. A tarball which first contains an entry for a hard link or symlink pointing to any file on the filesystem will have the link created, and then afterwards if the same file is listed in the tarball the hard link will be rewritten and any file can be rewritten on the filesystem.",
  "id": "GHSA-2367-c296-3mp2",
  "modified": "2023-06-13T21:53:47Z",
  "published": "2021-08-25T20:43:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-20990"
    },
    {
      "type": "WEB",
      "url": "https://github.com/alexcrichton/tar-rs/pull/156"
    },
    {
      "type": "WEB",
      "url": "https://github.com/alexcrichton/tar-rs/commit/54651a87ae6ba7d81fcc72ffdee2ea7eca2c7e85"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/alexcrichton/tar-rs"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2018-0002.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Arbitrary file overwrite in tar-rs"
}

GHSA-239G-2685-54X3

Vulnerability from github – Published: 2026-07-06 19:54 – Updated: 2026-07-06 19:54
VLAI
Summary
install: TOCTOU symlink race (unlink-then-create without O_EXCL) allows arbitrary file overwrite
Details

copy_file in install/src/install.rs removes the destination then recreates it by pathname via File::create / fs::copy without O_EXCL/create_new. Between the unlink and the recreate, a local attacker with write access to the destination directory can drop in a symlink and redirect the write.

Impact: when install runs privileged into an attacker-writable directory (staging/build paths), the race allows redirecting writes to arbitrary files and overwriting sensitive system files (/etc/passwd, /etc/shadow). Recommendation: create atomically with create_new/O_EXCL and copy via the opened fd rather than reopening by path.

Remediation: Acknowledged by Canonical; fixed in commit b5bbabc1.

Reported by Zellic in the uutils coreutils Program Security Assessment (prepared for Canonical, Jan 20 2026), audited commit 3a07ffc5a9bd4c283e75afa548ba1f1957bad242. Finding 3.50. Credit: Zellic.

Severity
6.3 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "uu_install"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.6.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35355"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-367",
      "CWE-59"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-06T19:54:08Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "`copy_file` in `install/src/install.rs` removes the destination then recreates it by pathname via `File::create` / `fs::copy` without `O_EXCL`/`create_new`. Between the unlink and the recreate, a local attacker with write access to the destination directory can drop in a symlink and redirect the write.\n\n**Impact:** when `install` runs privileged into an attacker-writable directory (staging/build paths), the race allows redirecting writes to arbitrary files and overwriting sensitive system files (`/etc/passwd`, `/etc/shadow`). Recommendation: create atomically with `create_new`/`O_EXCL` and copy via the opened fd rather than reopening by path.\n\n**Remediation:** Acknowledged by Canonical; fixed in commit b5bbabc1.\n\n---\n_Reported by Zellic in the *uutils coreutils Program Security Assessment* (prepared for Canonical, Jan 20 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`. Finding 3.50. Credit: Zellic._",
  "id": "GHSA-239g-2685-54x3",
  "modified": "2026-07-06T19:54:08Z",
  "published": "2026-07-06T19:54:08Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/uutils/coreutils/security/advisories/GHSA-239g-2685-54x3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35355"
    },
    {
      "type": "WEB",
      "url": "https://github.com/uutils/coreutils/pull/10067"
    },
    {
      "type": "WEB",
      "url": "https://github.com/uutils/coreutils/commit/b5bbabc18a1121908848d836f869a4e98eb63886"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/uutils/coreutils"
    },
    {
      "type": "WEB",
      "url": "https://github.com/uutils/coreutils/releases/tag/0.6.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "install: TOCTOU symlink race (unlink-then-create without O_EXCL) allows arbitrary file overwrite"
}
Mitigation MIT-48.1
Architecture and Design

Strategy: Separation of Privilege

  • Follow the principle of least privilege when assigning access rights to entities in a software system.
  • Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
CAPEC-132: Symlink Attack

An adversary positions a symbolic link in such a manner that the targeted user or application accesses the link's endpoint, assuming that it is accessing a file with the link's name.

CAPEC-17: Using Malicious Files

An attack of this type exploits a system's configuration that allows an adversary to either directly access an executable file, for example through shell access; or in a possible worst case allows an adversary to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.

CAPEC-35: Leverage Executable Code in Non-Executable Files

An attack of this type exploits a system's trust in configuration and resource files. When the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high.

CAPEC-76: Manipulating Web Input to File System Calls

An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.

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