Vulnerability in Arm Mbed TLS
CVE-2018-1000520
ARM mbedTLS version 2.7.0 and earlier contains a Ciphersuite Allows Incorrectly Signed Certificates vulnerability in mbedtls_ssl_get_verify_result() that can result in ECDSA-signed certificates are accepted, when only RSA-signed ones should be.. This attack appear to be exploitable via Peers negotiate a TLS-ECDH-RSA-* ciphersuite. Any of the peers can then provide an ECDSA-signed certificate, when only an RSA-signed one should be accepted..
Vulnerability class: Improper Certificate Validation
EPSS: 0.007 (49.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Arm Mbed_tls
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Third Party Advisory, x_refsource_MISC, Issue Tracking)
Frequently asked questions
- What is CVE-2018-1000520?
- CVE-2018-1000520 is a high-severity vulnerability in Arm Mbed TLS, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2018-06-26.
- How severe is CVE-2018-1000520?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2018-1000520 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.