SB2015061527 - Fedora 21 update for openssl

Description

This security bulletin contains information about 6 secuirty vulnerabilities.

1) Buffer overflow (CVE-ID: CVE-2015-1789)

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

The vulnerability exists due to a boundary error in the X509_cmp_time function in crypto/x509/x509_vfy.c. A remote attacker can trigger memory corruption and cause a denial of service condition on the target system.

2) NULL pointer dereference (CVE-ID: CVE-2015-1790)

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

The vulnerability exists due to a NULL pointer dereference error in the PKCS7_dataDecodefunction in crypto/pkcs7/pk7_doit.c. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

3) Resource management error (CVE-ID: CVE-2015-1792)

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

The vulnerability exists in the do_free_upto function in crypto/cms/cms_smime.c in OpenSSL. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack via vectors that trigger a NULL value of a BIO data structure.

4) Race condition (CVE-ID: CVE-2015-1791)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a race condition in the ssl3_get_new_session_ticket function in ssl/s3_clnt.c in OpenSSL. A local user can exploit the race and cause a denial of service (double free and application crash) or possibly have unspecified other impact by providing a NewSessionTicket during an attempt to reuse a ticket that had been obtained earlier.

5) Race condition (CVE-ID: CVE-2015-3216)

The vulnerability allows a local user to perform a denial of service attack.

The vulnerability exists due to a race condition in a certain Red Hat patch to the PRNG lock implementation in the ssleay_rand_bytes function in OpenSSL. A local user can exploit the race and cause a denial of service (application crash) by establishing many TLS sessions to a multithreaded server, leading to use of a negative value for a certain length field.

6) Buffer overflow (CVE-ID: CVE-2014-8176)

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

The dtls1_clear_queues function in ssl/d1_lib.c in OpenSSL before 0.9.8za, 1.0.0 before 1.0.0m, and 1.0.1 before 1.0.1h frees data structures without considering that application data can arrive between a ChangeCipherSpec message and a Finished message, which allows remote DTLS peers to cause a denial of service (memory corruption and application crash) or possibly have unspecified other impact via unexpected application data.

Remediation

Install update from vendor's website.

References

• https://bodhi.fedoraproject.org/updates/FEDORA-2015-10108