wolfSSL up to 5.6.4 Elliptic Curve information exposure

Summaryinfo

A vulnerability classified as problematic has been found in wolfSSL up to 5.6.4. Affected is an unknown function of the component Elliptic Curve Handler. Performing a manipulation results in information exposure. This vulnerability is reported as CVE-2024-1544. The attack requires a local approach. No exploit exists.

Detailsinfo

A vulnerability classified as problematic has been found in wolfSSL up to 5.6.4. This affects some unknown processing of the component Elliptic Curve Handler. The manipulation with an unknown input leads to a information exposure vulnerability. CWE is classifying the issue as CWE-203. The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not. This is going to have an impact on confidentiality. The summary by CVE is:

Generating the ECDSA nonce k samples a random number r and then truncates this randomness with a modular reduction mod n where n is the order of the elliptic curve. Meaning k = r mod n. The division used during the reduction estimates a factor q_e by dividing the upper two digits (a digit having e.g. a size of 8 byte) of r by the upper digit of n and then decrements q_e in a loop until it has the correct size. Observing the number of times q_e is decremented through a control-flow revealing side-channel reveals a bias in the most significant bits of k. Depending on the curve this is either a negligible bias or a significant bias large enough to reconstruct k with lattice reduction methods. For SECP160R1, e.g., we find a bias of 15 bits.

The weakness was disclosed by Florian Sieck, Luca Wilke and Thomas Eisenbarth. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2024-1544 since 02/15/2024. The exploitability is told to be difficult. Attacking locally is a requirement. Additional levels of successful authentication are required for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 212772 (CBL Mariner 2.0 Security Update: mariadb (CVE-2024-1544)), which helps to determine the existence of the flaw in a target environment.

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

The vulnerability is also documented in the databases at Tenable (212772) and EUVD (EUVD-2024-17291). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• wolfSSL

Version

• 5.6.0
• 5.6.1
• 5.6.2
• 5.6.3
• 5.6.4

License

• open-source

Website

• Product: https://github.com/wolfSSL/wolfssl/

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

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