DHE man-in-the-middle protection (Logjam)
A vulnerability in the TLS protocol allows a man-in-the-middle attacker to downgrade vulnerable TLS connections using ephemeral Diffie-Hellman key exchange to 512-bit export-grade cryptography. This vulnerability is known as Logjam (CVE-2015-4000).
OpenSSL has added protection for TLS clients by rejecting handshakes with DH parameters shorter than 768 bits. This limit will be increased to 1024 bits in a future release.
OpenSSL 1.0.2 users should upgrade to 1.0.2b
OpenSSL 1.0.1 users should upgrade to 1.0.1n
Fixes for this issue were developed by Emilia Käsper and Kurt Roeckx of the OpenSSL development team.
Malformed ECParameters causes infinite loop (CVE-2015-1788)
Severity: Moderate
When processing an ECParameters structure OpenSSL enters an infinite loop if the curve specified is over a specially malformed binary polynomial field.
This can be used to perform denial of service against any system which processes public keys, certificate requests or certificates. This includes TLS clients and TLS servers with client authentication enabled.
This issue affects OpenSSL versions: 1.0.2 and 1.0.1. Recent 1.0.0 and 0.9.8 versions are not affected. 1.0.0d and 0.9.8r and below are affected.
OpenSSL 1.0.2 users should upgrade to 1.0.2b
OpenSSL 1.0.1 users should upgrade to 1.0.1n
OpenSSL 1.0.0d (and below) users should upgrade to 1.0.0s
OpenSSL 0.9.8r (and below) users should upgrade to 0.9.8zg
This issue was reported to OpenSSL on 6th April 2015 by Joseph Birr-Pixton. The fix was developed by Andy Polyakov of the OpenSSL development team.
Exploitable out-of-bounds read in X509_cmp_time (CVE-2015-1789)
Severity: Moderate
X509_cmp_time does not properly check the length of the ASN1_TIME string and can read a few bytes out of bounds. In addition, X509_cmp_time accepts an arbitrary number of fractional seconds in the time string.
An attacker can use this to craft malformed certificates and CRLs of various sizes and potentially cause a segmentation fault, resulting in a DoS on applications that verify certificates or CRLs. TLS clients that verify CRLs are affected. TLS clients and servers with client authentication enabled may be affected if they use custom verification callbacks.
This issue affects all current OpenSSL versions: 1.0.2, 1.0.1, 1.0.0 and 0.9.8.
OpenSSL 1.0.2 users should upgrade to 1.0.2b
OpenSSL 1.0.1 users should upgrade to 1.0.1n
OpenSSL 1.0.0 users should upgrade to 1.0.0s
OpenSSL 0.9.8 users should upgrade to 0.9.8zg
This issue was reported to OpenSSL on 8th April 2015 by Robert Swiecki (Google), and independently on 11th April 2015 by Hanno Böck. The fix was developed by Emilia Käsper of the OpenSSL development team.
PKCS7 crash with missing EnvelopedContent (CVE-2015-1790)
Severity: Moderate
The PKCS#7 parsing code does not handle missing inner EncryptedContent correctly. An attacker can craft malformed ASN.1-encoded PKCS#7 blobs with missing content and trigger a NULL pointer dereference on parsing.
Applications that decrypt PKCS#7 data or otherwise parse PKCS#7 structures from untrusted sources are affected. OpenSSL clients and servers are not affected.
This issue affects all current OpenSSL versions: 1.0.2, 1.0.1, 1.0.0 and 0.9.8.
OpenSSL 1.0.2 users should upgrade to 1.0.2b
OpenSSL 1.0.1 users should upgrade to 1.0.1n
OpenSSL 1.0.0 users should upgrade to 1.0.0s
OpenSSL 0.9.8 users should upgrade to 0.9.8zg
This issue was reported to OpenSSL on 18th April 2015 by Michal Zalewski (Google). The fix was developed by Emilia Käsper of the OpenSSL development team.
CMS verify infinite loop with unknown hash function (CVE-2015-1792)
Severity: Moderate
When verifying a signedData message the CMS code can enter an infinite loop if presented with an unknown hash function OID.
This can be used to perform denial of service against any system which verifies signedData messages using the CMS code.
This issue affects all current OpenSSL versions: 1.0.2, 1.0.1, 1.0.0 and 0.9.8.
OpenSSL 1.0.2 users should upgrade to 1.0.2b
OpenSSL 1.0.1 users should upgrade to 1.0.1n
OpenSSL 1.0.0 users should upgrade to 1.0.0s
OpenSSL 0.9.8 users should upgrade to 0.9.8zg
This issue was reported to OpenSSL on 31st March 2015 by Johannes Bauer. The fix was developed by Dr. Stephen Henson of the OpenSSL development team.
Race condition handling NewSessionTicket (CVE-2015-1791)
Severity: Low
If a NewSessionTicket is received by a multi-threaded client when attempting to reuse a previous ticket then a race condition can occur potentially leading to a double free of the ticket data.
This issue affects all current OpenSSL versions: 1.0.2, 1.0.1, 1.0.0 and 0.9.8.
OpenSSL 1.0.2 users should upgrade to 1.0.2b
OpenSSL 1.0.1 users should upgrade to 1.0.1n
OpenSSL 1.0.0 users should upgrade to 1.0.0s
OpenSSL 0.9.8 users should upgrade to 0.9.8zg
This issue was discovered by Emilia Käsper of the OpenSSL development team. The fix was developed by Matt Caswell of the OpenSSL development team.
Invalid free in DTLS (CVE-2014-8176)
Severity: Moderate
This vulnerability does not affect current versions of OpenSSL. It existed in previous OpenSSL versions and was fixed in June 2014.
If a DTLS peer receives application data between the ChangeCipherSpec and Finished messages, buffering of such data may cause an invalid free, resulting in a segmentation fault or potentially, memory corruption.
This issue affected older OpenSSL versions 1.0.1, 1.0.0 and 0.9.8.
OpenSSL 0.9.8 DTLS users should upgrade to 0.9.8za
OpenSSL 1.0.0 DTLS users should upgrade to 1.0.0m.
OpenSSL 1.0.1 DTLS users should upgrade to 1.0.1h.
This issue was originally reported on March 28th 2014 in https://rt.openssl.org/Ticket/Display.html?id=3286 by Praveen Kariyanahalli, and subsequently by Ivan Fratric and Felix Groebert (Google). A fix was developed by zhu qun-ying.
The fix for this issue can be identified by commits bcc31166 (1.0.1), b79e6e3a (1.0.0) and 4b258e73 (0.9.8).
