Apple swift-asn1 up to 1.3.0 BER DER Parser syntactically invalid structure

Summaryinfo

A vulnerability described as critical has been identified in Apple swift-asn1 up to 1.3.0. Affected by this vulnerability is an unknown functionality of the component BER DER Parser. Such manipulation leads to improper handling of syntactically invalid structure. This vulnerability is uniquely identified as CVE-2025-0343. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Apple swift-asn1 up to 1.3.0 and classified as problematic. Affected by this issue is an unknown code block of the component BER DER Parser. The manipulation with an unknown input leads to a improper handling of syntactically invalid structure vulnerability. Using CWE to declare the problem leads to CWE-228. The product does not handle or incorrectly handles input that is not syntactically well-formed with respect to the associated specification. Impacted is availability. CVE summarizes:

Swift ASN.1 can be caused to crash when parsing certain BER/DER constructions. This crash is caused by a confusion in the ASN.1 library itself which assumes that certain objects can only be provided in either constructed or primitive forms, and will trigger a preconditionFailure if that constraint isn't met. Importantly, these constraints are actually required to be true in DER, but that correctness wasn't enforced on the early node parser side so it was incorrect to rely on it later on in decoding, which is what the library did. These crashes can be triggered when parsing any DER/BER format object. There is no memory-safety issue here: the crash is a graceful one from the Swift runtime. The impact of this is that it can be used as a denial-of-service vector when parsing BER/DER data from unknown sources, e.g. when parsing TLS certificates.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2025-0343 since 01/08/2025. The exploitation is known to be easy. There are neither technical details nor an exploit publicly available.

Upgrading to version 1.3.1 eliminates this vulnerability.

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Productinfo

Vendor

• Apple

Name

• swift-asn1

Version

• 1.0
• 1.1
• 1.2
• 1.3.0

License

• commercial

Website

• Vendor: https://www.apple.com/

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