CVE-2021-39229: Apprise Apprise Vulnerable To Regex Injection Vulnerability
HIGHCVE-2021-39229 is a HIGH (CVSS 7.5) apprise vulnerable to regex injection vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Apprise libraries in the PyPI ecosystem. The issue involves apprise vulnerable to regex injection with ifttt plugin. Remediation is available by upgrading affected packages to version 0.9.5.1.
CVE-2021-39229 at a Glance
Security Impact
CVSS: 7.5
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
How to Fix CVE-2021-39229
To remediate this vulnerability, upgrade all affected Apprise dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
pip install apprise>=0.9.5.1Run the following command in your project directory to verify that all resolved dependencies use the patched release:
pip show appriseHow to Check if You Are Affected
To determine whether your Python environment is affected by CVE-2021-39229, inspect your installed packages using pip:
pip show appriseAnalyze the terminal output to locate any version of Apprise in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.9.5.1), your application is affected.
Note: The pip show apprise command checks currently installed packages in your active Python environment.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Apprise, 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
CVE-2021-39229 Affected Apprise Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
apprise
|
PyPI |
< 0.9.5.1
|
0.9.5.1
|
References
Frequently Asked Questions
What is CVE-2021-39229?
Which Apprise versions are affected?
What version fixes CVE-2021-39229?
Is apprise affected?
What is the CVSS score of CVE-2021-39229?
What CWE is associated with CVE-2021-39229?
How can I check PyPI dependencies for CVE-2021-39229?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-qhmp-h54x-38qr",
"modified" : "2024-09-12T20:54:36Z",
"published" : "2021-09-20T20:57:02Z",
"aliases" : [ "CVE-2021-39229" ],
"summary" : "Apprise vulnerable to regex injection with IFTTT Plugin",
"details" : "### Impact\nAnyone _publicly_ hosting the Apprise library and granting them access to the IFTTT notification service.\n\n### Patches\nUpdate to Apprise v0.9.5.1\n ```bash\n # Install Apprise v0.9.5.1 from PyPI\n pip install apprise==0.9.5.1\n ```\n\nThe patch to the problem was performed [here](https://github.com/caronc/apprise/pull/436/files).\n\n### Workarounds\nAlternatively, if upgrading is not an option, you can safely remove the following file:\n- `apprise/plugins/NotifyIFTTT.py` \n\nThe above will eliminate the ability to use IFTTT, but everything else will work smoothly.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [Apprise](https://github.com/caronc/apprise/issues)\n* Email me at [lead2gold@gmail.com](mailto:lead2gold@gmail.com)\n\n### Additional Credit\nGithub would not allow me to additionally credit **Rasmus Petersen**, but I would like to put that here at the very least - thank you for finding and reporting this issue along with those already credited\n\n## Additional Notes:\n- Github would not allow me to add/tag the 2 CWE's this issue is applicable to (only CWE-400). The other is: CWE-730 (placed in the title)\n",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}, {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "PyPI",
"name" : "apprise"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "0.9.5.1"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 0.9.4"
}
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/caronc/apprise/security/advisories/GHSA-qhmp-h54x-38qr"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-39229"
}, {
"type" : "WEB",
"url" : "https://github.com/caronc/apprise/pull/436"
}, {
"type" : "WEB",
"url" : "https://github.com/caronc/apprise/commit/e20fce630d55e4ca9b0a1e325a5fea6997489831"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/caronc/apprise"
}, {
"type" : "WEB",
"url" : "https://github.com/caronc/apprise/blob/0007eade20934ddef0aba38b8f1aad980cfff253/apprise/plugins/NotifyIFTTT.py#L356-L359"
}, {
"type" : "WEB",
"url" : "https://github.com/caronc/apprise/releases/tag/v0.9.5.1"
}, {
"type" : "WEB",
"url" : "https://github.com/pypa/advisory-database/tree/main/vulns/apprise/PYSEC-2021-327.yaml"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-400" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2021-09-20T20:30:36Z",
"nvd_published_at" : "2021-09-20T22:15:00Z"
}
}