Vulnerability in Composer Windows-Setup
CVE-2020-15145
In Composer-Setup for Windows before version 6.0.0, if the developer's computer is shared with other users, a local attacker may be able to exploit the following scenarios. 1. A local regular user may modify the existing `C:\ProgramData\ComposerSetup\bin\composer.bat` in order to get elevated command execution when composer is run by an administrator. 2. A local regular user may create a specially crafted dll in the `C:\ProgramData\ComposerSetup\bin` folder in order to get Local System privileges. See: https://itm4n.github.io/windows-server-netman-dll-hijacking. 3. If the directory of the php.exe selected by the user is not in the system path, it is added without checking that it is admin secured, as per Microsoft guidelines. See: https://msrc-blog.microsoft.com/2018/04/04/triaging-a-dll-planting-vulnerability.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (32.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Composer Windows-Setup — versions < 6.0.0
- Getcomposer Composer-Setup
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/composer/windows-setup/security/advisories/GHSA-wgrx-r3qv-332c (Third Party Advisory)
- github.com/composer/windows-setup/commit/ca9f1435d368e3377e82d60ef0c7b795afa9f8… (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-15145?
- CVE-2020-15145 is a medium-severity vulnerability in Composer Windows-Setup, classified under Incorrect Default Permissions. CVSS score: 6.7/10. Published 2020-08-14.
- How severe is CVE-2020-15145?
- Medium severity. CVSS v3 base score is 6.7 out of 10.
- Is CVE-2020-15145 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.