PT-2018-9417 · Arm+2 · Mbed Tls+2

Iluxonchik · Published 2018-03-26 · Updated 2020-11-05 · CVE-2018-1000520

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions mbedTLS version 2.7.0 and earlier

Description The issue allows incorrectly signed certificates, specifically accepting ECDSA-signed certificates when only RSA-signed ones should be accepted. This can occur when peers negotiate a TLS-ECDH-RSA-* ciphersuite, and any peer can provide an ECDSA-signed certificate. The mbedtls ssl get verify result() function is involved in this issue.

Recommendations For mbedTLS version 2.7.0 and earlier, consider updating to a version that fixes this issue, as the current version may accept incorrectly signed certificates. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Certificate Validation

Weakness Enumeration

CWE-295

Related Identifiers

ALT-PU-2018-1495

CVE-2018-1000520

ECHO-0118-38E9-4EDB

Affected Products

Alt Linux

Debian

Mbed Tls

References · 8

• https://osv.dev/vulnerability/CVE-2018-1000520 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2018-1000520 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2018-1000520 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-1000520 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2018-1000520 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-1000520 · Security Note
• https://cve.org/CVERecord?id=CVE-2018-1000520 · Security Note
• https://github.com/ARMmbed/mbedtls/issues/1561 · Note