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Sid 1-44375

Message

SERVER-OTHER Open SSL 1.0.2 DoS attempt with an invalid signature algorithm

Summary

The sigalgs implementation in t1lib.c in OpenSSL 1.0.2 before 1.0.2a allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) by using an invalid signaturealgorithms extension in the ClientHello message during a renegotiation.

Impact

CVSS base score 5.0 CVSS impact score 2.9 CVSS exploitability score 10.0 confidentialityImpact NONE integrityImpact NONE availabilityImpact NONE

CVE-2015-0291:

CVSS base score 5.0

CVSS impact score 2.9

CVSS exploitability score 10.0

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

Detailed information

CVE-2015-0291: The sigalgs implementation in t1lib.c in OpenSSL 1.0.2 before 1.0.2a allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) by using an invalid signaturealgorithms extension in the ClientHello message during a renegotiation.

Affected systems

  • openssl openssl 1.0.2

Ease of attack

CVE-2015-0291:

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

False positives

None known

False negatives

None known

Corrective action

Upgrade to the latest non-affected version of the software.

Apply the appropriate vendor supplied patches.

Contributors

  • Talos research team.
  • This document was generated from data supplied by the national vulnerability database, a product of the national institute of standards and technology.
  • For more information see nvd.

Additional References

  • www.openssl.org/news/secadv/20150319.txt