The SSL 3.0 implementation in OpenSSL before 0.9.8s and 1.x before 1.0.0f does not properly initialize data structures for block cipher padding, which might allow remote attackers to obtain sensitive information by decrypting the padding data sent by an SSL peer.

The Server Gated Cryptography (SGC) implementation in OpenSSL before 0.9.8s and 1.x before 1.0.0f does not properly handle handshake restarts, which allows remote attackers to cause a denial of service (CPU consumption) via unspecified vectors.

OpenSSL before 0.9.8s and 1.x before 1.0.0f, when RFC 3779 support is enabled, allows remote attackers to cause a denial of service (assertion failure) via an X.509 certificate containing certificate-extension data associated with (1) IP address blocks or (2) Autonomous System (AS) identifiers.

The DTLS implementation in OpenSSL before 0.9.8s and 1.x before 1.0.0f performs a MAC check only if certain padding is valid, which makes it easier for remote attackers to recover plaintext via a padding oracle attack.

crypto/x509/x509vfy.c in OpenSSL 1.0.x before 1.0.0e does not initialize certain structure members, which makes it easier for remote attackers to bypass CRL validation by using a nextUpdate value corresponding to a time in the past.

From the upstream advisory [1]:

OpenSSL server code for ephemeral ECDH ciphersuites is not thread-safe, and furthermore can crash if a client violates the protocol by sending handshake messages in incorrect order. (CVE-2011-3210)

This issue applies to OpenSSL 0.9.8 through 0.9.8s (experimental "ECCdraft" ciphersuites) and to OpenSSL 1.0.0 through 1.0.0d.

Affected users of OpenSSL should update to the OpenSSL 1.0.0e release, which contains a patch to correct this issue. If you cannot immediately upgrade, we recommend that you disable ephemeral ECDH ciphersuites if you have enabled them.

Thanks to Adam Langley <agl> for identifying and fixing this issue.

Only server-side applications that specifically support ephemeral ECDH ciphersuites are affected by the ephemeral ECDH crash bug and only if ephemeral ECDH ciphersuites are enabled in the configuration. You can check to see if application supports ephemeral ECDH ciphersuites by looking for SSLCTXsettmpecdh, SSLsettmpecdh, SSLCTRLSETTMPECDH, SSLCTXsettmpecdhcallback, SSLsettmpecdhcallback, SSLCTRLSETTMPECDHCB in the source code.

[1] http://www.openssl.org/news/secadv20110906.txt

Statement:

Not vulnerable. This issue did not affect the versions of openssl as shipped with Red Hat Enterprise Linux 3, 4, 5, or 6, as they do not include the support for the elliptic curve cryptography.

The elliptic curve cryptography (ECC) subsystem in OpenSSL 1.0.0d and earlier, when the Elliptic Curve Digital Signature Algorithm (ECDSA) is used for the ECDHEECDSA cipher suite, does not properly implement curves over binary fields, which makes it easier for context-dependent attackers to determine private keys via a timing attack and a lattice calculation.

Integer underflow in OpenSSL before 0.9.8x, 1.0.0 before 1.0.0j, and 1.0.1 before 1.0.1c, when TLS 1.1, TLS 1.2, or DTLS is used with CBC encryption, allows remote attackers to cause a denial of service (buffer over-read) or possibly have unspecified other impact via a crafted TLS packet that is not properly handled during a certain explicit IV calculation.

The asn1d2ireadbio function in crypto/asn1/ad2ifp.c in OpenSSL before 0.9.8v, 1.0.0 before 1.0.0i, and 1.0.1 before 1.0.1a does not properly interpret integer data, which allows remote attackers to conduct buffer overflow attacks, and cause a denial of service (memory corruption) or possibly have unspecified other impact, via crafted DER data, as demonstrated by an X.509 certificate or an RSA public key.

The mimeparamcmp function in crypto/asn1/asnmime.c in OpenSSL before 0.9.8u and 1.x before 1.0.0h allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted S/MIME message, a different vulnerability than CVE-2006-7250.

The implementation of Cryptographic Message Syntax (CMS) and PKCS #7 in OpenSSL before 0.9.8u and 1.x before 1.0.0h does not properly restrict certain oracle behavior, which makes it easier for context-dependent attackers to decrypt data via a Million Message Attack (MMA) adaptive chosen ciphertext attack.

A flaw was found in the way that OpenSSL handled OCSP response verification, which could be exploited to conduct a denial of service attack. This flaw affects all versions of OpenSSL and is fixed in versions 1.0.1d, 1.0.0k, and 0.9.8y.

External References:

http://www.openssl.org/news/secadv20130205.txt

Last updated 24 July 2024

Multiple flaws were found in the way OpenSSL parsed X.509 certificates. An attacker could use these flaws to modify an X.509 certificate to produce a certificate with a different fingerprint without invalidating its signature, and possibly bypass fingerprint-based blacklisting in applications.

Memory leak in the tlsdecryptticket function in t1lib.c in OpenSSL before 0.9.8zc, 1.0.0 before 1.0.0o, and 1.0.1 before 1.0.1j allows remote attackers to cause a denial of service (memory consumption) via a crafted session ticket that triggers an integrity-check failure.

OpenSSL before 0.9.8zc, 1.0.0 before 1.0.0o, and 1.0.1 before 1.0.1j does not properly enforce the no-ssl3 build option, which allows remote attackers to bypass intended access restrictions via an SSL 3.0 handshake, related to s23clnt.c and s23srvr.c.

OpenSSL before 0.9.8zd, 1.0.0 before 1.0.0p, and 1.0.1 before 1.0.1k allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted DTLS message that is processed with a different read operation for the handshake header than for the handshake body, related to the dtls1getrecord function in d1pkt.c and the ssl3readn function in s3pkt.c.

The BNsqr implementation in OpenSSL before 0.9.8zd, 1.0.0 before 1.0.0p, and 1.0.1 before 1.0.1k does not properly calculate the square of a BIGNUM value, which might make it easier for remote attackers to defeat cryptographic protection mechanisms via unspecified vectors, related to crypto/bn/asm/mips.pl, crypto/bn/asm/x8664-gcc.c, and crypto/bn/bnasm.c.

The ssl3getkeyexchange function in s3clnt.c in OpenSSL before 0.9.8zd, 1.0.0 before 1.0.0p, and 1.0.1 before 1.0.1k allows remote SSL servers to conduct ECDHE-to-ECDH downgrade attacks and trigger a loss of forward secrecy by omitting the ServerKeyExchange message.

It was found that OBJobj2txt may cause pretty printing functions such as X509nameoneline, X509nameprintex, and others, to leak information from the stack. If applications echo pretty printing output, then a remote attacker could exploit this flaw to read information from the stack. OpenSSL clients and servers are not affected by this flaw; only applications that echo pretty printing output are affected.

A vulnerability in the processing of DTLS handshake messages was found that results in large amounts of memory being used. Once the Denial Of Service attack has ceased, the memory will be freed.

Double free vulnerability in d1both.c in the DTLS implementation in OpenSSL 0.9.8 before 0.9.8zb, 1.0.0 before 1.0.0n, and 1.0.1 before 1.0.1i allows remote attackers to cause a denial of service (application crash) via crafted DTLS packets that trigger an error condition.

Multiple buffer overflows in crypto/srp/srplib.c in the SRP implementation in OpenSSL 1.0.1 before 1.0.1i allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via an invalid SRP (1) g, (2) A, or (3) B parameter.

By pathologically modifying a clients ClientHello message with fragmentation, it's possible to cause the server to negotiate TLS 1.0 instead of a higher version, even if both client and server support a higher protocol version.

A race condition was found in the sslparseserverhellotlsext() code that may result in upto 255 bytes being written to memory that had been free'd if an ec point format extension was sent by the server. This issue only affects multi-threaded clients.

It was found that OpenSSL DTLS clients using anonymous (EC)DH ciphersuites could be crashed by a malicious server via a handshake message.

It was found that an attacker could force OpenSSL to leak memory and never free it via DTLS packets.

ssl/s3clnt.c in OpenSSL 1.0.0 before 1.0.0t, 1.0.1 before 1.0.1p, and 1.0.2 before 1.0.2d, when used for a multi-threaded client, writes the PSK identity hint to an incorrect data structure, which allows remote servers to cause a denial of service (race condition and double free) via a crafted ServerKeyExchange message.

The ASN1TYPEcmp function in crypto/asn1/atype.c in OpenSSL before 0.9.8zf, 1.0.0 before 1.0.0r, 1.0.1 before 1.0.1m, and 1.0.2 before 1.0.2a does not properly perform boolean-type comparisons, which allows remote attackers to cause a denial of service (invalid read operation and application crash) via a crafted X.509 certificate to an endpoint that uses the certificate-verification feature.

A NULL pointer dereference flaw was found in OpenSSL's X509toX509REQ() function. A remote attacker could use this flaw to crash an OpenSSL server with an invalid certificate key. Note that this function is rarely used in practice.

This issue affects OpenSSL versions: 1.0.2, 1.0.1, 1.0.0, and 0.9.8. This issue is fixed in versions: 1.0.2a, 1.0.1m, 1.0.0r, and 0.9.8zf.

Upstream patch:

https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=28a00bcd8e318da18031b2ac8778c64147cd54f9

Acknowledgements:

Red Hat would like to thank the OpenSSL project for reporting this issue. Upstream acknowledges Brian Carpenter as the original reporter.