Publish GHSA-wwv8-cqpr-vx3m

Author: advisory-database[bot]

advisories/github-reviewed/2026/03/GHSA-wwv8-cqpr-vx3m/GHSA-wwv8-cqpr-vx3m.json

@@ -0,0 +1,68 @@
+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-wwv8-cqpr-vx3m",
+  "modified": "2026-03-25T17:03:37Z",
+  "published": "2026-03-25T17:03:37Z",
+  "aliases": [
+    "CVE-2026-27602"
+  ],
+  "summary": "Modoboa has OS Command Injection",
+  "details": "### Summary\n\n`exec_cmd()` in `modoboa/lib/sysutils.py` always runs subprocess calls with `shell=True`. Since domain names flow directly into shell command strings without any sanitization, a Reseller or SuperAdmin can include shell metacharacters in a domain name to run arbitrary OS commands on the server.\n\n### Details\n\nThe root cause is in `modoboa/lib/sysutils.py:31`:\n\n```python\nkwargs[\"shell\"] = True\nprocess = subprocess.Popen(cmd, **kwargs)\n```\n\nWhen a create a domain is created with DKIM enabled, the domain name gets embedded into a shell command like this:\n\n```python\nexec_cmd(f\"openssl genrsa -out {dkim_storage_dir}/{domain.name}.pem {key_size}\")\n```\n\nIf the domain name contains something like `$(id>/tmp/proof).example.com`, the shell executes the injected command before running openssl.\n\nThe same pattern appears in several other places:\n\n- `modoboa/admin/jobs.py:38` — mailbox rename via `mv` using `full_address`\n- `modoboa/amavis/lib.py:202` — `sa-learn` using `domain.name`\n- `modoboa/admin/models/mailbox.py:150` — `doveadm user` using `full_address`\n- `modoboa/maillog/graphics.py:105–107` — `rrdtool` using `domain.name`\n- `modoboa/webmail/models.py:54–57` — `doveadm move/delete` using `account.email`\n\n### PoC\n\n1. Deploy modoboa <= 2.7.0\n2. Log in as a Reseller or SuperAdmin\n3. Create a new domain named `$(id>/tmp/proof).example.com` with DKIM enabled\n4. SSH into the server and read `/tmp/proof`\n\nSomething like this will be displayed:\n\n```\nuid=0(root) gid=0(root) groups=0(root)\n```\n\nConfirmed on commit b521bcb4f (latest main at time of discovery).\n\n### Impact\n\nAn attacker with Reseller-level access (or higher) can execute arbitrary OS commands on the mail server — in a typical Modoboa deployment this means running as root. All six identified sinks are reachable through normal application workflows.",
+  "severity": [
+    {
+      "type": "CVSS_V3",
+      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "PyPI",
+        "name": "modoboa"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "2.7.1"
+            }
+          ]
+        }
+      ],
+      "database_specific": {
+        "last_known_affected_version_range": "<= 2.7.0"
+      }
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/modoboa/modoboa/security/advisories/GHSA-wwv8-cqpr-vx3m"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/modoboa/modoboa/commit/27a7aa133d3608fe8c25ae39125d1012c333cbfa"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/modoboa/modoboa"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/modoboa/modoboa/releases/tag/2.7.1"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-78"
+    ],
+    "severity": "HIGH",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-03-25T17:03:37Z",
+    "nvd_published_at": null
+  }
+}