CVE-2018-1000520
published 2018-06-26CVE-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…
PriorityP338high7.5CVSS 3.0
AVNACLPRNUINSUCNIHAN
EPSS
0.71%
49.5th percentile
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..
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| arm | mbed_tls | <= 2.7.0 | — |
| debian | mbedtls | — | — |
CVSS provenance
nvdv3.07.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:N/I:P/A:N
osv7.5HIGH
vendor_debian7.5LOW
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Debian
CVE-2018-1000520: mbedtls - ARM mbedTLS version 2.7.0 and earlier contains a Ciphersuite Allows Incorrectly ...
vendor_debian·2018·CVSS 7.5
CVE-2018-1000520 [HIGH] CVE-2018-1000520: mbedtls - ARM mbedTLS version 2.7.0 and earlier contains a Ciphersuite Allows Incorrectly ...
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..
Scope: local
bookworm: open
bullseye: open
forky: open
sid: open
trixie: open
GHSA
GHSA-fjhp-rw56-p66f: ARM mbedTLS version 2
ghsa_unreviewed·2022-05-13
CVE-2018-1000520 [HIGH] CWE-295 GHSA-fjhp-rw56-p66f: ARM mbedTLS version 2
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..
OSV
CVE-2018-1000520: ARM mbedTLS version 2
osv·2018-06-26·CVSS 7.5
CVE-2018-1000520 [HIGH] CVE-2018-1000520: ARM mbedTLS version 2
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..
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2018-1000520 mbedtls: Allows incorrectly signed certificate
bugzilla·2018-06-27·CVSS 7.5
CVE-2018-1000520 [HIGH] CVE-2018-1000520 mbedtls: Allows incorrectly signed certificate
CVE-2018-1000520 mbedtls: Allows incorrectly signed certificate
When the negotiated ciphersuite is of the type TLS-ECDH-RSA-* (ECDH key exchange + RSA signed certificate), ECDSA signed certificates are accepted, which means that the ciphersuite technically becomes TLS-ECDH-ECDSA.
Upstream issue:
https://github.com/ARMmbed/mbedtls/issues/1561
Discussion:
Created mbedtls tracking bugs for this issue:
Affects: epel-all [bug 1595604]
Affects: fedora-all [bug 1595603]
---
@Andrej
I think we should close this. See: https://github.com/ARMmbed/mbedtls/issues/1561#issuecomment-424756997
---
(In reply to Morten Stevens from comment #2)
> @Andrej
>
> I think we should close this. See:
> https://github.com/ARMmbed/mbedtls/issues/1561#issuecomment-424756997
I agree with the upstream analysi
Bugzilla
CVE-2018-1000520 mbedtls: Allows incorrectly signed certificate [epel-all]
bugzilla·2018-06-27·CVSS 7.5
CVE-2018-1000520 [HIGH] CVE-2018-1000520 mbedtls: Allows incorrectly signed certificate [epel-all]
CVE-2018-1000520 mbedtls: Allows incorrectly signed certificate [epel-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of epel-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects multiple supported versions of F
Bugzilla
CVE-2018-1000520 mbedtls: Allows incorrectly signed certificate [fedora-all]
bugzilla·2018-06-27·CVSS 7.5
CVE-2018-1000520 [HIGH] CVE-2018-1000520 mbedtls: Allows incorrectly signed certificate [fedora-all]
CVE-2018-1000520 mbedtls: Allows incorrectly signed certificate [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects multiple supported versions
2018-06-26
Published