CVE-2018-0497 — ARM mbed TLS before 2

ARM mbed TLS before 2.12.0, before 2.7.5, and before 2.1.14 allows remote attackers to achieve partial plaintext recovery (for a CBC based ciphersuite) via a timing-based side-channel attack. This vulnerability exists because of an incorrect fix (with a wrong SHA-384 calculation)

01What is this vulnerability?

ARM mbed TLS before 2.12.0, before 2.7.5, and before 2.1.14 allows remote attackers to achieve partial plaintext recovery (for a CBC based ciphersuite) via a timing-based side-channel attack. This vulnerability exists because of an incorrect fix (with a wrong SHA-384 calculation) for CVE-2013-0169.

02Affected products

Vendor	Product	Versions
n	a / ARM mbed TLS before 2.12.0, before 2.7.5, and before 2.1.14	ARM mbed TLS before 2.12.0, before 2.7.5, and before 2.1.14

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

08Timeline

• Published: 2018-07-28T17:00:00.000Z
• Last modified: 2024-08-05T03:28:11.012Z

09References

• lists.debian.org — https://lists.debian.org/debian-lts-announce/2018/09/msg00029.html
• www.debian.org — https://www.debian.org/security/2018/dsa-4296
• tls.mbed.org — https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-…
• usn.ubuntu.com — https://usn.ubuntu.com/4267-1/