| Descripción: | Summary:
OpenSSL is prone to multiple vulnerabilities.
Vulnerability Insight:
OpenSSL suffers from the possibility of multiple vulnerabilities due to:
1) Missing message length checks which results in Out of Bounds reads up to 2 bytes beyond the allocated buffer, this leads to Denial of Service.
The attack works only if client authentication is enabled.
2) Calling MDC2_Update() can cause an overflow if an attacker is able to supply very large amounts of input data after a previous
call to EVP_EncryptUpdate() with a partial block then a length check can overflow resulting in a heap corruption.
3) A malfored SHA512 TLS session ticket resulting in an Out of Bounds read which leads to service crash.
4) Unchecking the return value of BN_div_word() function causing an Out of Bounds write if it is used with an overly large BIGNUM. TLS is not affected.
5) Misusing OBJ_obj2txt() function by the function TS_OBJ_print_bio() will results in Out of Bounds reads when large OIDs are presented.
6) DTLS out-of-order messages handling which enable an attacker to cause a DoS attack through memory exhaustion.
7) A flaw in the DTLS replay attack protection mechanism enabling the attacker to send records for next epochs with a very large sequence number,
this causes in dropping all the subsequent legitimate packets and causing a denial of service for a specific DTLS connection.
Vulnerability Impact:
Successful exploitation could result in Denial of Service.
Affected Software/OS:
OpenSSL 1.0.2 and 1.0.1.
Solution:
OpenSSL 1.0.2 users should upgrade to 1.0.2i, OpenSSL 1.0.1 users should upgrade to 1.0.1u.
CVSS Score:
7.5
CVSS Vector:
AV:N/AC:L/Au:N/C:P/I:P/A:P
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