mbedtls: CVE-2020-10932

Debian Bug report logs - #963159
mbedtls: CVE-2020-10932

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: mbedtls: CVE-2020-10932

Date: Fri, 19 Jun 2020 20:03:33 +0200

Source: mbedtls
Version: 2.16.5-1
Severity: important
Tags: security upstream

Hi,

The following vulnerability was published for mbedtls.

CVE-2020-10932[0]:
| An issue was discovered in Arm Mbed TLS before 2.16.6 and 2.7.x before
| 2.7.15. An attacker that can get precise enough side-channel
| measurements can recover the long-term ECDSA private key by (1)
| reconstructing the projective coordinate of the result of scalar
| multiplication by exploiting side channels in the conversion to affine
| coordinates; (2) using an attack described by Naccache, Smart, and
| Stern in 2003 to recover a few bits of the ephemeral scalar from those
| projective coordinates via several measurements; and (3) using a
| lattice attack to get from there to the long-term ECDSA private key
| used for the signatures. Typically an attacker would have sufficient
| access when attacking an SGX enclave and controlling the untrusted OS.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2020-10932
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10932
[1] https://tls.mbed.org/tech-updates/releases/mbedtls-2.16.6-and-2.7.15-released
[2] https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-04

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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