#VU97654 Out-of-bounds read in mbed TLS - CVE-2022-46393

Vulnerability identifier: #VU97654

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-46393

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
mbed TLS
Universal components / Libraries / Libraries used by multiple products

Vendor: ARM

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to heap-based buffer overread in DTLS if MBEDTLS_SSL_DTLS_CONNECTION_ID is enabled and MBEDTLS_SSL_CID_IN_LEN_MAX > 2 * MBEDTLS_SSL_CID_OUT_LEN_MAX. A remote attacker can perform a denial of service attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

mbed TLS: 2.0.0, 2.1.0 - 2.19.1, 2.2.0 - 2.28.1, 2.3.0, 2.4.0 - 2.4.2, 2.5.0 - 2.5.1, 2.6.0 - 2.6.1, 2.7.0 - 2.7.19, 2.8.0, 2.9.0, 3.0.0, 3.1.0, 3.2.0, 3.2.1

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External links
https://github.com/Mbed-TLS/mbedtls/releases/tag/v2.28.2
https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.3.0

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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.