Information disclosure in mbedtls (Alpine package)

1) Information disclosure

EUVDB-ID: #VU31909

Risk: Medium

CVSSv4.0: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-16910

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled, use an RNG with insufficient entropy for blinding, which might allow an attacker to recover a private key via side-channel attacks if a victim signs the same message many times. (For Mbed TLS, the fix is also available in versions 2.7.12 and 2.16.3.)

Mitigation

Install update from vendor's website.

Vulnerable software versions

mbedtls (Alpine package): 2.16.1-r1 - 2.16.2-r0

CPE2.3

• cpe:2.3:a:alpine:mbedtls_alpine_package:2.16.1-r1:*:*:*:*:alpine_linux:*:3.9
• cpe:2.3:a:alpine:mbedtls_alpine_package:2.16.2-r0:*:*:*:*:alpine_linux:*:3.10

External links

https://git.alpinelinux.org/aports/commit/?id=7c957c41625c408c47ca8aa93fd986ac6fec39a2
https://git.alpinelinux.org/aports/commit/?id=c087d07fafa8d964c90795fd34c46fda72a152a4
https://git.alpinelinux.org/aports/commit/?id=f0377de9384c6b80e8d69a847c1c2450f68f50da

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.