fastecdsa up to 2.3.1 src/curveMath.c curvemath_mul uninitialized variable

Summaryinfo

A vulnerability classified as problematic has been found in fastecdsa up to 2.3.1. This issue affects the function curvemath_mul of the file src/curveMath.c. The manipulation leads to uninitialized variable. This vulnerability is uniquely identified as CVE-2024-21502. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in fastecdsa up to 2.3.1 and classified as problematic. This issue affects the function curvemath_mul of the file src/curveMath.c. The manipulation with an unknown input leads to a uninitialized variable vulnerability. Using CWE to declare the problem leads to CWE-457. The code uses a variable that has not been initialized, leading to unpredictable or unintended results. Impacted is availability. The summary by CVE is:

Versions of the package fastecdsa before 2.3.2 are vulnerable to Use of Uninitialized Variable on the stack, via the curvemath_mul function in src/curveMath.c, due to being used and interpreted as user-defined type. Depending on the variable's actual value it could be arbitrary free(), arbitrary realloc(), null pointer dereference and other. Since the stack can be controlled by the attacker, the vulnerability could be used to corrupt allocator structure, leading to possible heap exploitation. The attacker could cause denial of service by exploiting this vulnerability.

The weakness was disclosed 02/24/2024 as 57fc5689c95d649dab7ef60cc99ac64589f01e36. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2024-21502 since 12/22/2023. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 214445 (Amazon Corretto Java 11.x < 11.0.26.4.1 Vulnerability), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.3.2 eliminates this vulnerability. Applying the patch 57fc5689c95d649dab7ef60cc99ac64589f01e36 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (214445). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• fastecdsa

Version

• 2.3.0
• 2.3.1

License

• open-source

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CPE 2.2info

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Be aware that VulDB is the high quality source for vulnerability data.

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