A vulnerability was found in python-ecdsa (Programming Language Software) (affected version unknown). It has been declared as problematic. This vulnerability affects an unknown functionality of the component Signature Decoding Handler. The manipulation as part of a DER Signature leads to a error condition vulnerability. The CWE definition for the vulnerability is CWE-391. [PLANNED FOR DEPRECATION. SEE MAINTENANCE NOTES AND CONSIDER CWE-252, CWE-248, OR CWE-1069.] Ignoring exceptions and other error conditions may allow an attacker to induce unexpected behavior unnoticed. As an impact it is known to affect availability. CVE summarizes:

An error-handling flaw was found in python-ecdsa. During signature decoding, malformed DER signatures could raise unexpected exceptions (or no exceptions at all), which could lead to a denial of service.

The weakness was disclosed 11/26/2019 as not defined bug report (Bugzilla). The advisory is shared for download at bugzilla.redhat.com. This vulnerability was named CVE-2019-14853 since 08/10/2019. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The entry VDB-148218 is pretty similar.

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• Programming Language Software

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• python-ecdsa

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