CVE-2025-0343 – swift-asn1

Package

Manager: swift
Name: swift-asn1
Vulnerable Version: >=0 <1.3.1

Severity

Level: Low

CVSS v3.1: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:U/RC:C

CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

EPSS: 0.00098 pctl0.27954

Details

CVE-2025-0343: Swift ASN.1 can crash when parsing maliciously formed BER/DER 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. Many thanks to @baarde for reporting this issue and providing the fix.

Metadata

Created: 2025-01-14T16:32:07Z
Modified: 2025-01-15T15:26:01Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/01/GHSA-w8xv-rwgf-4fwh/GHSA-w8xv-rwgf-4fwh.json
CWE IDs: ["CWE-228"]
Alternative ID: GHSA-w8xv-rwgf-4fwh
Finding: F140
Auto approve: 1