CVE-2019-19274 typed-ast Out-of-bounds Read
An out-of-bounds read in typed_ast allows attackers to crash the Python interpreter by providing malicious source code for parsing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-19274?
CVE-2019-19274 is a high-severity denial of service vulnerability in n/a, published on 26 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
typed_ast 1.3.0 and 1.3.1 has a handle_keywordonly_args out-of-bounds read. An attacker with the ability to cause a Python interpreter to parse Python source (but not necessarily execute it) may be able to crash the interpreter process. This could be a concern, for example, in a web-based service that parses (but does not execute) Python code. (This issue also affected certain Python 3.8.0-alpha prereleases.)
Weakness: CWE-125
Which versions are affected by CVE-2019-19274?
3 open source packages ship an affected version, including typed-ast. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
typed-ast PyPI | All versions | 1.3.2 |
typed-ast PyPI | From 1.3.0 | 1.3.2 |
typed-ast PyPI | From 1.3.0 | 1.3.2 |
Products include Python Typed Ast.
How do I fix CVE-2019-19274?
Upgrade typed-ast to 1.3.2 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2019-19274 being exploited?
There is no known exploitation of CVE-2019-19274 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as DEBIAN-CVE-2019-19274, GHSA-m3jw-62m7-jjcm, PYSEC-2019-130, UBUNTU-CVE-2019-19274.