USN-2673-1

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USN-2673-1

Summary: thunderbird vulnerabilities

Details: Karthikeyan Bhargavan discovered that NSS incorrectly handled state transitions for the TLS state machine. If a remote attacker were able to perform a machine-in-the-middle attack, this flaw could be exploited to skip the ServerKeyExchange message and remove the forward-secrecy property. (CVE-2015-2721) Bob Clary, Christian Holler, Bobby Holley, and Andrew McCreight discovered multiple memory safety issues in Thunderbird. If a user were tricked in to opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service via application crash, or execute arbitrary code with the privileges of the user invoking Thunderbird. (CVE-2015-2724) Ronald Crane discovered multiple security vulnerabilities. If a user were tricked in to opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service via application crash, or execute arbitrary code with the privileges of the user invoking Thunderbird. (CVE-2015-2734, CVE-2015-2735, CVE-2015-2736, CVE-2015-2737, CVE-2015-2738, CVE-2015-2739, CVE-2015-2740) Matthew Green discovered a DHE key processing issue in NSS where a MITM could force a server to downgrade TLS connections to 512-bit export-grade cryptography. An attacker could potentially exploit this to impersonate the server. (CVE-2015-4000)

References: https://ubuntu.com/security/notices/USN-2673-1, https://ubuntu.com/security/CVE-2015-2721, https://ubuntu.com/security/CVE-2015-2724, https://ubuntu.com/security/CVE-2015-2734, https://ubuntu.com/security/CVE-2015-2735, https://ubuntu.com/security/CVE-2015-2736, https://ubuntu.com/security/CVE-2015-2737, https://ubuntu.com/security/CVE-2015-2738, https://ubuntu.com/security/CVE-2015-2739, https://ubuntu.com/security/CVE-2015-2740, https://ubuntu.com/security/CVE-2015-4000