SB2016091618 - Multiple vulnerabilities in OpenSSL

Description

This security bulletin contains information about 5 secuirty vulnerabilities.

1) Observable discrepancy (CVE-ID: CVE-2016-2178)

The vulnerability allows a local user to perform timing attack.

The vulnerability exists due to an error within the dsa_sign_setup() function in crypto/dsa/dsa_ossl.c. A local user can obtain a DSA private key via a timing side-channel attack.

2) Resource management error (CVE-ID: CVE-2016-2179)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources in the Datagram TLS (DTLS) implementation. A remote attacker can initiate and maintain multiple crafted DTLS sessions simultaneously and perform a denial of service (DoS) attack.

3) Input validation error (CVE-ID: CVE-2016-2181)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input within the Anti-Replay feature in the DTLS implementation when using a new epoch number in conjunction with a large sequence number. A remote attacker can perform a denial of service (DoS) attack (false-positive packet drops) via spoofed DTLS records.

4) Out-of-bounds write (CVE-ID: CVE-2016-2182)

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error within the BN_bn2dec() function in crypto/bn/bn_print.c in OpenSSL. A remote attacker can send specially crafted data to the server, trigger an out-of-bounds write and execute arbitrary code on the target system.

5) Out-of-bounds read (CVE-ID: CVE-2016-2180)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition within the TS_OBJ_print_bio() function in crypto/ts/ts_lib.c in the X.509 Public Key Infrastructure Time-Stamp Protocol (TSP) implementation in OpenSSL. A remote attacker can perform a denial of service (DoS) attack via a crafted time-stamp file that is mishandled by the "openssl ts" command.

Remediation

Install update from vendor's website.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1343400
• https://git.openssl.org/?p=openssl.git;a=commit;h=399944622df7bd81af62e67ea967c470534090e2
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-2179
• https://git.openssl.org/?p=openssl.git;a=commit;h=f5c7f5dfbaf0d2f7d946d0fe86f08e6bcb36ed0d
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-2181
• https://git.openssl.org/?p=openssl.git;a=commit;h=1fb9fdc3027b27d8eb6a1e6a846435b070980770
• https://git.openssl.org/?p=openssl.git;a=commit;h=07bed46f332fce8c1d157689a2cdf915a982ae34
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-2182
• https://github.com/openssl/openssl/commit/0ed26acce328ec16a3aa635f1ca37365e8c7403a
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-2180