CVE-2018-9860

moderate-risk

Published 2018-04-12

An issue was discovered in Botan 1.11.32 through 2.x before 2.6.0. An off-by-one error when processing malformed TLS-CBC ciphertext could cause the receiving side to include in the HMAC computation exactly 64K bytes of data following the record buffer, aka an over-read. The MAC comparison will subsequently fail and the connection will be closed. This could be used for denial of service. No information leak occurs.

Do I need to act?

0.50% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.5/10 High

NETWORK / LOW complexity

Affected Products (1)

Botan

Affected Vendors

Botan Project

References (4)

Vendor Advisory https://botan.randombit.net/security.html

Issue Tracking https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7434

Vendor Advisory https://botan.randombit.net/security.html

Issue Tracking https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7434

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moderate-risk

Severity 26/34 · High

Exploitability 2/34 · Minimal

Exposure 5/34 · Minimal