SB2015062202 - Gentoo update for OpenSSL

Description

This security bulletin contains information about 7 secuirty vulnerabilities.

1) 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.

2) Resource management error (CVE-ID: CVE-2015-1788)

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

The vulnerability exists due to improper management of internal resources within the application in the BN_GF2m_mod_inv function in crypto/bn/bn_gf2m.c. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

3) 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.

4) 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.

5) 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.

6) 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.

7) Man-in-the-middle attack (CVE-ID: CVE-2015-4000)

The vulnerability allows a remote attacker to decrypt TLS connections in certain situations.

The vulnerability exists due to boundary error when parsing HTTP requests. A remote unauthenticated attacker can conduct a man-in-the-middle attack that can lead to the target system to downgrade the Diffie-Hellman algorithm to 512-bit export-grade cryptography.

Successful exploitation of this vulnerability may result in modification of authentication information

Remediation

Install update from vendor's website.

References

• https://security.gentoo.org/glsa/201506-02