Buffer Underflow Affecting armmbed/mbedtls package, versions [3.5.0,3.6.2)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published21 Oct 2024
- disclosed15 Oct 2024
- creditUnknown
Introduced: 15 Oct 2024
CVE-2024-49195 (opens in a new tab)How to fix?
Upgrade armmbed/mbedtls to version 3.6.2 or higher.
Overview
Affected versions of this package are vulnerable to Buffer Underflow in the mbedtls_pk_write_key_der() and mbedtls_pk_write_key_pem() functions when processing data from an opaque key PK context (MBEDTLS_PK_OPAQUE), when the MBEDTLS_USE_PSA_CRYPTO option is in use. An attacker can cause stack or heap corruption by supplying a malicious key pair.
mbedtls_pk_write_key_der() is vulnerable if either the MBEDTLS_ECP_C option is enabled and the output buffer in use is smaller than the public key representation, or the output buffer for an RSA key is smaller than the actual output.
mbedtls_pk_write_key_pem() is vulnerable if MBEDTLS_MPI_MAX_SIZE <= 420 for an RSA key.
Workaround
This vulnerability can be avoided by disabling the compile-time MBEDTLS_USE_PSA_CRYPTO option.