It was discovered that a specially crafted S/MIME message with an inner encryption layer could be displayed as having a valid signature in some circumstances, even if the signer had no access to the encrypted message. An attacker could potentially exploit this to spoof the message author. (CVE-2019-11755)
Multiple security issues were discovered 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, bypass security restrictions, bypass same-origin restrictions, conduct cross-site scripting (XSS) attacks, or execute arbitrary code. (CVE-2019-11757, CVE-2019-11758, CVE-2019-11759, CVE-2019-11760, CVE-2019-11761, CVE-2019-11762, CVE-2019-11763, CVE-2019-11764)
A heap overflow was discovered in the expat library in Thunderbird. If a user were tricked in to opening a specially crafted message, an attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2019-15903)
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{ "cves": [ { "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "type": "CVSS_V3" }, { "score": "medium", "type": "Ubuntu" } ], "id": "CVE-2019-11755" }, { "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "type": "CVSS_V3" }, { "score": "medium", "type": "Ubuntu" } ], "id": "CVE-2019-11757" }, { "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "type": "CVSS_V3" }, { "score": "medium", "type": "Ubuntu" } ], "id": "CVE-2019-11759" }, { "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "type": "CVSS_V3" }, { "score": "medium", "type": "Ubuntu" } ], "id": "CVE-2019-11760" }, { "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "type": "CVSS_V3" }, { "score": "medium", "type": "Ubuntu" } ], "id": "CVE-2019-11761" }, { "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "type": "CVSS_V3" }, { "score": "medium", "type": "Ubuntu" } ], "id": "CVE-2019-11762" }, { "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "type": "CVSS_V3" }, { "score": "medium", "type": "Ubuntu" } ], "id": "CVE-2019-11763" }, { "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "type": "CVSS_V3" }, { "score": "medium", "type": "Ubuntu" } ], "id": "CVE-2019-11764" }, { "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "type": "CVSS_V3" }, { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "type": "CVSS_V3" }, { "score": "medium", "type": "Ubuntu" } ], "id": "CVE-2019-15903" } ], "ecosystem": "Ubuntu:18.04:LTS" }