[Debian-iot-maintainers] Bug#1101499: mbedtls: CVE-2025-27809 CVE-2025-27810

[Moritz Mühlenhoff]

Source: mbedtls
X-Debbugs-CC: team at security.debian.org
Severity: important
Tags: security

Hi,

The following vulnerabilities were published for mbedtls.

CVE-2025-27809[0]:
| Mbed TLS before 2.28.10 and 3.x before 3.6.3, on the client side,
| accepts servers that have trusted certificates for arbitrary
| hostnames unless the TLS client application calls
| mbedtls_ssl_set_hostname.

https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-1/

CVE-2025-27810[1]:
| Mbed TLS before 2.28.10 and 3.x before 3.6.3, in some cases of
| failed memory allocation or hardware errors, uses uninitialized
| stack memory to compose the TLS Finished message, potentially
| leading to authentication bypasses such as replays.

https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-2/


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

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2025-27809
    https://www.cve.org/CVERecord?id=CVE-2025-27809
[1] https://security-tracker.debian.org/tracker/CVE-2025-27810
    https://www.cve.org/CVERecord?id=CVE-2025-27810

Please adjust the affected versions in the BTS as needed.