FatPipe WARP, IPVPN, and MPVPN Configuration Upload exploit
CVE-2021-27860 is a high-severity unrestricted upload of file with dangerous type vulnerability in WARP from FatPipe, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. The record lists versions 10.1.2r60p92, 10.2.2r44p1 as the first without the flaw, so updating WARP to one of those releases or later removes the exposure. CISA added it to the Known Exploited Vulnerabilities catalogue on January 10, 2022, which means attacks have been observed in the wild.
Attackers are already exploiting this vulnerability, according to CISA.
What to do
- Update WARP to 10.1.2r60p92 or 10.2.2r44p1, whichever matches your release line, or a later version.
- Update IPVPN to 10.1.2r60p92 or 10.2.2r44p1, whichever matches your release line, or a later version.
- Update MPVPN to 10.1.2r60p92 or 10.2.2r44p1, whichever matches your release line, or a later version.
- CISA's required action: Apply updates per vendor instructions.
- Read the advisory on fatpipeinc.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| FatPipe | WARP | 10.1 up to, but not including, 10.1.2r60p92; 10.2 up to, but not including, 10.2.2r44p1 | 10.1.2r60p92, 10.2.2r44p1 |
| FatPipe | IPVPN | 10.1 up to, but not including, 10.1.2r60p92; 10.2 up to, but not including, 10.2.2r44p1 | 10.1.2r60p92, 10.2.2r44p1 |
| FatPipe | MPVPN | 10.1 up to, but not including, 10.1.2r60p92; 10.2 up to, but not including, 10.2.2r44p1 | 10.1.2r60p92, 10.2.2r44p1 |
| Fatpipeinc | Ipvpn Firmware | 5.2.0; 6.1.2; 7.1.2; 9.1.2; 10.1.2; 10.2.2 | Not stated |
| Fatpipeinc | Warp Firmware | 5.2.0; 6.1.2; 7.1.2; 9.1.2; 10.1.2; 10.2.2 | Not stated |
| Fatpipeinc | Mpvpn Firmware | 5.2.0; 6.1.2; 7.1.2; 9.1.2; 10.1.2; 10.2.2 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 9.8 | Critical | CNA (cert.org) |
| CVSS 3.1 | 8.8 | High | NVD |
| CVSS 2.0 | 9.3 | High | NVD |
Official description
A vulnerability in the web management interface of FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p92 and 10.2.2r44p1 allows a remote, unauthenticated attacker to upload a file to any location on the filesystem. The FatPipe advisory identifier for this vulnerability is FPSA006.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Unrestricted Upload of File with Dangerous Type
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
How developers prevent this class of flaw
- Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
- Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically.
More Unrestricted Upload of File with Dangerous Type vulnerabilities (CWE-434)
Timeline
- CVE record published.
- Added to CISA's Known Exploited Vulnerabilities catalogue.
- Deadline for US federal agencies to remediate, set by CISA.
- CISA published its SSVC assessment (exploitation: active, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Patches and release notes
- ic3.gov/Media/News/2021/211117-2.pdfExploit, Mitigation, Third Party Advisory, US Government Resource
Third-party and government advisories
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27860US Government Resource
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