CVE-2019-3902 : A flaw was found in Mercurial before 4.9. It was possible to use symlinks and su

A flaw was found in Mercurial before 4.9. It was possible to use symlinks and subrepositories to defeat Mercurial's path-checking logic and write files outside a repository.

Published 2019-04-22 16:29:02

Updated 2020-07-31 13:15:12

Source Red Hat, Inc.

View at NVD, CVE.org

Vulnerability category: Directory traversal

Products affected by CVE-2019-3902

Debian » Debian Linux » Version: 8.0
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
Matching versions
Redhat » Enterprise Linux » Version: 7.0
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
Matching versions
Mercurial » Mercurial
Versions before (<) 4.9
cpe:2.3:a:mercurial:mercurial:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2019-3902

EPSS FAQ

1.00%

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

~ 75 %

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

CVSS scores for CVE-2019-3902

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.8	MEDIUM	AV:N/AC:M/Au:N/C:N/I:P/A:P	8.6	4.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: Partial
5.9	MEDIUM	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N	2.2	3.6	NIST
Attack Vector: Network Attack Complexity: High Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: High Availability: None
5.1	MEDIUM	CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N	1.4	3.6	Red Hat, Inc.
Attack Vector: Local Attack Complexity: High Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: High Availability: None

CWE ids for CVE-2019-3902

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Assigned by: secalert@redhat.com (Secondary)
CWE-59 Improper Link Resolution Before File Access ('Link Following')

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2019-3902

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3902

1696025 – (CVE-2019-3902) CVE-2019-3902 mercurial: Path-checking logic bypass via symlinks and subrepositories
Issue Tracking;Vendor Advisory
https://usn.ubuntu.com/4086-1/

USN-4086-1: Mercurial vulnerability | Ubuntu security notices
https://lists.debian.org/debian-lts-announce/2020/07/msg00032.html

[SECURITY] [DLA 2293-1] mercurial security update

CVEs referencing this url
https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.9_.282019-02-01.29

WhatsNew - Mercurial
Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/04/msg00024.html

[SECURITY] [DLA 1764-1] mercurial security update
Third Party Advisory

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Vulnerability Details : CVE-2019-3902

Products affected by CVE-2019-3902

Exploit prediction scoring system (EPSS) score for CVE-2019-3902

CVSS scores for CVE-2019-3902

CWE ids for CVE-2019-3902

References for CVE-2019-3902