Arch Linux Security Advisory ASA-201501-2 ========================================= Severity: High Date : 2015-01-09 CVE-ID : CVE-2014-3571 CVE-2015-0206 CVE-2014-3569 CVE-2014-3572 CVE-2015-0204 CVE-2015-0205 CVE-2014-8275 CVE-2014-3570 Package : openssl Type : multiple issues Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package openssl before version 1.0.1.k-1 is vulnerable to multiple issues, including but not limited to denial of service, cipher downgrade, certificate verification bypass and certificate fingerprint modification. Resolution ========== Upgrade to 1.0.1.k-1. # pacman -Syu "openssl>=1.0.1.k-1" The problems have been fixed upstream in version 1.0.1.k. Workaround ========== None. Description =========== - CVE-2014-3571 (denial of service) A remote attacker is able 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 dtls1_get_record function in d1_pkt.c and the ssl3_read_n function in s3_pkt.c. - CVE-2015-0206 (denial of service) A memory leak can occur in the dtls1_buffer_record function under certain conditions. In particular this could occur if an attacker sent repeated DTLS records with the same sequence number but for the next epoch. The memory leak could be exploited by an attacker in a denial of service attack through memory exhaustion. - CVE-2014-3569 (denial of service) The ssl23_get_client_hello function in s23_srvr.c does not properly handle attempts to use unsupported protocols, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an unexpected handshake, as demonstrated by an SSLv3 handshake to a no-ssl3 application with certain error handling. - CVE-2014-3572 (cipher downgrade) An OpenSSL client will accept a handshake using an ephemeral ECDH ciphersuite using an ECDSA certificate if the server key exchange message is omitted. This effectively removes forward secrecy from the ciphersuite. - CVE-2015-0204 (cipher downgrade) The ssl3_get_key_exchange function in s3_clnt.c allows remote SSL servers to conduct RSA-to-EXPORT_RSA downgrade attacks and facilitate brute-force decryption by offering a weak ephemeral RSA key in a noncompliant role. - CVE-2015-0205 (certificate verification bypass) An OpenSSL server will accept a DH certificate for client authentication without the certificate verify message. This effectively allows a client to authenticate without the use of a private key. This only affects servers which trust a client certificate authority which issues certificates containing DH keys. - CVE-2014-8275 (certificate fingerprint modification) OpenSSL accepts several non-DER-variations of certificate signature algorithm and signature encodings. OpenSSL also does not enforce a match between the signature algorithm between the signed and unsigned portions of the certificate. By modifying the contents of the signature algorithm or the encoding of the signature, it is possible to change the certificate's fingerprint. This does not allow an attacker to forge certificates, and does not affect certificate verification or OpenSSL servers/clients in any other way. It also does not affect common revocation mechanisms. Only custom applications that rely on the uniqueness of the fingerprint (e.g. certificate blacklists) may be affected. - CVE-2014-3570 (bignum squaring error) The BN_sqr implementation 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/x86_64-gcc.c, and crypto/bn/bn_asm.c. Impact ====== A remote attacker is able to perform denial of service attacks, downgrade the cipher (effectively removing forward secrecy) or bypass certificate blacklists via various vectors. References ========== https://www.openssl.org/news/secadv_20150108.txt https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-3571 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-0206 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-3569 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-3572 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-0204 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-0205 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-8275 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-3570