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CVE-2019-11755

Status Candidate

Overview

A crafted S/MIME message consisting of an inner encryption layer and an outer SignedData layer was shown as having a valid digital signature, although the signer might have had no access to the contents of the encrypted message, and might have stripped a different signature from the encrypted message. Previous versions had only suppressed showing a digital signature for messages with an outer multipart/signed layer. This vulnerability affects Thunderbird < 68.1.1.

Related Files

Ubuntu Security Notice USN-4202-2
Posted Dec 10, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4202-2 - USN-4202-1 fixed vulnerabilities in Thunderbird. After upgrading, Thunderbird created a new profile for some users. This update fixes the problem. 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. 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 attacks, or execute arbitrary code. 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.

tags | advisory, denial of service, overflow, arbitrary, spoof, vulnerability, xss
systems | linux, ubuntu
advisories | CVE-2019-11755, CVE-2019-11761, CVE-2019-15903
MD5 | 9fff7c893619a32a00e008fd58151899
Debian Security Advisory 4571-1
Posted Nov 18, 2019
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4571-1 - Multiple security issues have been found in Thunderbird which could potentially result in the execution of arbitrary code or denial of service.

tags | advisory, denial of service, arbitrary
systems | linux, debian
advisories | CVE-2019-11755, CVE-2019-11757, CVE-2019-11759, CVE-2019-11760, CVE-2019-11761, CVE-2019-11762, CVE-2019-11763, CVE-2019-11764, CVE-2019-15903
MD5 | efc9c0ea3531da747ebe551da4587b93
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