matrix-org vodozemac up to 0.6.x Base64 Encoding timing discrepancy

Summaryinfo

A vulnerability was found in matrix-org vodozemac up to 0.6.x and classified as problematic. This affects an unknown part of the component Base64 Encoding Handler. Such manipulation leads to timing discrepancy. This vulnerability is documented as CVE-2024-40640. The attack needs to be performed locally. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in matrix-org vodozemac up to 0.6.x. Affected by this issue is an unknown code of the component Base64 Encoding Handler. The manipulation with an unknown input leads to a timing discrepancy vulnerability. Using CWE to declare the problem leads to CWE-208. Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. Impacted is confidentiality. CVE summarizes:

vodozemac is an open source implementation of Olm and Megolm in pure Rust. Versions before 0.7.0 of vodozemac use a non-constant time base64 implementation for importing key material for Megolm group sessions and `PkDecryption` Ed25519 secret keys. This flaw might allow an attacker to infer some information about the secret key material through a side-channel attack. The use of a non-constant time base64 implementation might allow an attacker to observe timing variations in the encoding and decoding operations of the secret key material. This could potentially provide insights into the underlying secret key material. The impact of this vulnerability is considered low because exploiting the attacker is required to have access to high precision timing measurements, as well as repeated access to the base64 encoding or decoding processes. Additionally, the estimated leakage amount is bounded and low according to the referenced paper. This has been patched in commit 734b6c6948d4b2bdee3dd8b4efa591d93a61d272 which has been included in release version 0.7.0. Users are advised to upgrade. There are no known workarounds for this vulnerability.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2024-40640 since 07/08/2024. The exploitation is known to be difficult. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 0.7.0 eliminates this vulnerability.

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Productinfo

Vendor

• matrix-org

Name

• vodozemac

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6

Website

• Product: https://github.com/matrix-org/vodozemac/

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