Sid 1-51333

Message

SERVER-OTHER OpenSSL TLS record tampering denial of service attempt

Summary

This event is generated when an attempt to cause a denial of service in an OpenSSL based client is detected.

Impact

Attempted Denial of Service

CVE-2013-4353:

CVSS base score 4.3

CVSS impact score 2.9

CVSS exploitability score 8.6

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

Detailed information

CVE-2013-4353: The ssl3takemac function in ssl/s3_both.c in OpenSSL 1.0.1 before 1.0.1f allows remote TLS servers to cause a denial of service (NULL pointer dereference and application crash) via a crafted Next Protocol Negotiation record in a TLS handshake.

Affected systems

• openssl openssl 1.0.1
• openssl openssl 1.0.1a
• openssl openssl 1.0.1b
• openssl openssl 1.0.1c
• openssl openssl 1.0.1d
• openssl openssl 1.0.1e

Ease of attack

CVE-2013-4353:

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

False positives

False negatives

Corrective action

Contributors

• Cisco's Talos Intelligence Group

Additional References

• www.openssl.org/news/vulnerabilities.html#2013-4353