CVE-2019-14853 Duplicate Advisory: possible DoS caused by malformed signature decoding in Pure-Python ECDSA
Attackers can cause a denial of service in applications using the python-ecdsa library by submitting malformed DER signatures that trigger unexpected exceptions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-14853?
CVE-2019-14853 is a low-severity denial of service vulnerability in [UNKNOWN] python-ecdsa, published on 26 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An error-handling flaw was found in python-ecdsa before version 0.13.3. During signature decoding, malformed DER signatures could raise unexpected exceptions (or no exceptions at all), which could lead to a denial of service.
Which versions are affected by CVE-2019-14853?
5 open source packages ship an affected version, including ecdsa. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
ecdsa PyPI | All versions | 0.13.3 |
ecdsa PyPI | All versions | 0.13.3 |
ecdsa PyPI | All versions | 0.13.3 |
ecdsa PyPI | All versions | 0.13.3 |
ecdsa PyPI | All versions | 0.13.3 |
Products include Python-Ecdsa Project Python-Ecdsa.
How do I fix CVE-2019-14853?
Upgrade ecdsa to 0.13.3 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-2019-14853 being exploited?
There is no known exploitation of CVE-2019-14853 in the wild and no public exploit code.
Other vulnerabilities in [UNKNOWN] python-ecdsa
Sources
Also known as DEBIAN-CVE-2019-14853, GHSA-2mrj-435v-c2cr, GHSA-pwfw-mgfj-7g3g, PYSEC-2019-177, UBUNTU-CVE-2019-14853.