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CVE-2019-9803

Status Candidate

Overview

The Upgrade-Insecure-Requests (UIR) specification states that if UIR is enabled through Content Security Policy (CSP), navigation to a same-origin URL must be upgraded to HTTPS. Firefox will incorrectly navigate to an HTTP URL rather than perform the security upgrade requested by the CSP in some circumstances, allowing for potential man-in-the-middle attacks on the linked resources. This vulnerability affects Firefox < 66.

Related Files

Ubuntu Security Notice USN-3918-4
Posted Apr 17, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3918-4 - USN-3918-1 fixed vulnerabilities in Firefox. The update caused web compatibility and performance issues with some websites. This update fixes the problem. Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service via application crash, denial of service via successive FTP authorization prompts or modal alerts, trick the user with confusing permission request prompts, obtain sensitive information, conduct social engineering attacks, or execute arbitrary code. A mechanism was discovered that removes some bounds checking for string, array, or typed array accesses if Spectre mitigations have been disabled. If a user were tricked in to opening a specially crafted website with Spectre mitigations disabled, an attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. It was discovered that Upgrade-Insecure-Requests was incorrectly enforced for same-origin navigation. An attacker could potentially exploit this to conduct man-in-the-middle attacks. Various other issues were also addressed.

tags | advisory, web, denial of service, arbitrary, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-9791, CVE-2019-9793, CVE-2019-9799, CVE-2019-9803, CVE-2019-9808
MD5 | 84b03fa22a51ba0b63c8c1a390101295
Ubuntu Security Notice USN-3918-3
Posted Mar 29, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3918-3 - USN-3918-1 fixed vulnerabilities in Firefox. The update caused web compatibility issues with some websites. This update fixes the problem. Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service via application crash, denial of service via successive FTP authorization prompts or modal alerts, trick the user with confusing permission request prompts, obtain sensitive information, conduct social engineering attacks, or execute arbitrary code. A mechanism was discovered that removes some bounds checking for string, array, or typed array accesses if Spectre mitigations have been disabled. If a user were tricked in to opening a specially crafted website with Spectre mitigations disabled, an attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. It was discovered that Upgrade-Insecure-Requests was incorrectly enforced for same-origin navigation. An attacker could potentially exploit this to conduct man-in-the-middle attacks. Various other issues were also addressed.

tags | advisory, web, denial of service, arbitrary, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-9791, CVE-2019-9793, CVE-2019-9799, CVE-2019-9803, CVE-2019-9808
MD5 | 79d2df9d3251aec55839d0a5fa67270f
Ubuntu Security Notice USN-3918-2
Posted Mar 25, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3918-2 - USN-3918-1 fixed vulnerabilities in Firefox. This update provides the corresponding updates for Ubuntu 14.04 LTS. Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service via application crash, denial of service via successive FTP authorization prompts or modal alerts, trick the user with confusing permission request prompts, obtain sensitive information, conduct social engineering attacks, or execute arbitrary code. A mechanism was discovered that removes some bounds checking for string, array, or typed array accesses if Spectre mitigations have been disabled. If a user were tricked in to opening a specially crafted website with Spectre mitigations disabled, an attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. It was discovered that Upgrade-Insecure-Requests was incorrectly enforced for same-origin navigation. An attacker could potentially exploit this to conduct man-in-the-middle attacks. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-9788, CVE-2019-9791, CVE-2019-9792, CVE-2019-9793, CVE-2019-9797, CVE-2019-9799, CVE-2019-9803, CVE-2019-9805, CVE-2019-9808, CVE-2019-9809
MD5 | 3cc54cc98b969abde01121cb96a68dd0
Ubuntu Security Notice USN-3918-1
Posted Mar 22, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3918-1 - Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service via application crash, denial of service via successive FTP authorization prompts or modal alerts, trick the user with confusing permission request prompts, obtain sensitive information, conduct social engineering attacks, or execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2019-9788, CVE-2019-9791, CVE-2019-9792, CVE-2019-9793, CVE-2019-9797, CVE-2019-9799, CVE-2019-9802, CVE-2019-9803, CVE-2019-9805, CVE-2019-9808, CVE-2019-9809
MD5 | 7a027189c82bdc87f59c8d573a89c651
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