Multiple vulnerabilities in Mbed TLS



Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2020-16150
CWE-ID CWE-310
Exploitation vector Local
Public exploit N/A
Vulnerable software
 mbed TLS
Universal components / Libraries / Libraries used by multiple products

Vendor ARM

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Side channel attack on classical CBC decryption in (D)TLS

EUVDB-ID: #VU46187

Risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-16150

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

The vulnerability allows a local user to perform a side-channel attack.

The vulnerability is caused due to mbed TLS used dummy rounds of the compression function associated with the hash used for HMAC in order to hide the length of the padding to remote attackers when ecrypting/authenticating (D)TLS record in a connection using a CBC ciphersuite without the Encrypt-then-Mac extension. A local user  who is able to observe the state of the cache could monitor the presence of mbedtls_md_process() in the cache in order to determine when the actual computation ends and when the dummy rounds start. This is a reliable target as it's always called at least once.

Successful exploitation of the vulnerability may allow an attacker with access to enough information about the state of the cache (including, but not limited to, an untrusted operating system attacking a secure enclave such as SGX or the TrustZone secure world) to recover portions of the plaintext of a (D)TLS record.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

mbed TLS: 2.0.0 - 2.23.0

CPE2.3 External links

https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-09-1


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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

2) Side channel attack on RSA and static Diffie-Hellman

EUVDB-ID: #VU46188

Risk: Low

CVSSv4.0: 1.9 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to mbed TLS is using the GCD functio, which is prone to a single-trace side-channel attack. An attacker with access to precise enough timing and memory access information (typically an untrusted operating system attacking a secure enclave such as SGX or the TrustZone secure world) can recover the private keys used in RSA or static (finite-field) Diffie-Hellman operations.


Mitigation

Install updates from vendor's website.

Vulnerable software versions

mbed TLS: 2.0.0 - 2.23.0

CPE2.3
External links

https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-09-2


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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



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