LibTomCrypt up to 1.18.1 ECDSA Signature key management

Summaryinfo

A vulnerability, which was classified as problematic, was found in LibTomCrypt up to 1.18.1. The affected element is an unknown function of the component ECDSA Signature Handler. Such manipulation leads to key management. This vulnerability is documented as CVE-2018-12437. The attack can be executed directly on the physical device. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in LibTomCrypt up to 1.18.1. Affected by this issue is some unknown functionality of the component ECDSA Signature Handler. The manipulation with an unknown input leads to a key management vulnerability. Using CWE to declare the problem leads to CWE-320. Impacted is confidentiality. CVE summarizes:

LibTomCrypt through 1.18.1 allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.

The bug was discovered 06/13/2018. The weakness was released 06/15/2018 (Website). The advisory is shared for download at nccgroup.trust. This vulnerability is handled as CVE-2018-12437 since 06/14/2018. The attack needs to be approached locally. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1600.001.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 111238 (Fedora 27 : libtomcrypt (2018-39e0872379)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277484 (Fedora Security Update for libtomcrypt (FEDORA-2018-9d667bdff8)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (111238). Entries connected to this vulnerability are available at VDB-119572, VDB-119577, VDB-119578 and VDB-119579. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• LibTomCrypt

Version

• 1.18.0
• 1.18.1

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CPE 2.2info

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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