CVE-2020-15658 : The code for downloading files did not properly take care of special characters,

The code for downloading files did not properly take care of special characters, which led to an attacker being able to cut off the file ending at an earlier position, leading to a different file type being downloaded than shown in the dialog. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.

Published 2020-08-10 18:15:13

Updated 2023-02-02 22:23:19

Source Mozilla Corporation

View at NVD, CVE.org

Products affected by CVE-2020-15658

Mozilla » Firefox
Versions before (<) 79.0
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Matching versions
Mozilla » Thunderbird
Versions before (<) 78.1
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Matching versions
Mozilla » Firefox Esr
Versions before (<) 78.1
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
Matching versions
Canonical » Ubuntu Linux » Version: 18.04 LTS Edition
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
Matching versions
Canonical » Ubuntu Linux » Version: 16.04 ESM Edition
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
Matching versions
Canonical » Ubuntu Linux » Version: 20.04 LTS Edition
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2020-15658

EPSS FAQ

0.23%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 61 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-15658

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:P/A:N	8.6	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N	2.8	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: None Integrity: High Availability: None

CWE ids for CVE-2020-15658

CWE-754 Improper Check for Unusual or Exceptional Conditions

The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2020-15658

http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00025.html

[security-announce] openSUSE-SU-2020:1189-1: important: Security update
Third Party Advisory

CVEs referencing this url
https://www.mozilla.org/security/advisories/mfsa2020-32/

Security Vulnerabilities fixed in Firefox ESR 78.1 — Mozilla
Vendor Advisory

CVEs referencing this url
https://bugzilla.mozilla.org/show_bug.cgi?id=1637745

Access Denied
Issue Tracking;Permissions Required;Vendor Advisory
https://usn.ubuntu.com/4443-1/

USN-4443-1: Firefox vulnerabilities | Ubuntu security notices | Ubuntu
Third Party Advisory

CVEs referencing this url
https://www.mozilla.org/security/advisories/mfsa2020-33/

Security Vulnerabilities fixed in Thunderbird 78.1 — Mozilla
Vendor Advisory

CVEs referencing this url
https://www.mozilla.org/security/advisories/mfsa2020-30/

Security Vulnerabilities fixed in Firefox 79 — Mozilla
Vendor Advisory

CVEs referencing this url

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Vulnerability Details : CVE-2020-15658

Products affected by CVE-2020-15658

Exploit prediction scoring system (EPSS) score for CVE-2020-15658

CVSS scores for CVE-2020-15658

CWE ids for CVE-2020-15658

References for CVE-2020-15658