CyberSecBulletin
CVE-2019-8394Exploited in the wildNVD status: Analyzed

Zoho ManageEngine ServiceDesk Plus (SDP) File Upload

Published Updated By the CyberSecBulletin desk

CVE-2019-8394 is a medium-severity unrestricted upload of file with dangerous type vulnerability in Manageengine Servicedesk Plus from Zoho, with a CVSS 3.1 base score of 6.5 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists version 10.0.0 as the first without the flaw, so updating Manageengine Servicedesk Plus to that release or later removes the exposure. CISA added it to the Known Exploited Vulnerabilities catalogue on November 3, 2021, which means attacks have been observed in the wild.

Patch now

Attackers are already exploiting this vulnerability, according to CISA.

What to do

  1. Update Manageengine Servicedesk Plus to 10.0.0 or a later version.
  2. CISA's required action: Apply updates per vendor instructions.
  3. Read the advisory on manageengine.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
ZohoManageengine Servicedesk Plusbefore 10.0.0; 10.0.010.0.0

Version data comes from NVD's product matching. 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
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
NoneNo data is disclosed.
Integrity
HighData or code can be modified at will.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.16.5MediumNVD
CVSS 3.17.5HighCISA (ADP)
CVSS 2.04.0MediumNVD

Official description

Zoho ManageEngine ServiceDesk Plus (SDP) before 10.0 build 10012 allows remote attackers to upload arbitrary files via login page customization.

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

  1. CVE record published.
  2. Added to CISA's Known Exploited Vulnerabilities catalogue.
  3. Deadline for US federal agencies to remediate, set by CISA.
  4. CISA published its SSVC assessment (exploitation: active, automatable: no, technical impact: partial).
  5. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Technical write-ups (may include proof of concept)

Other vulnerabilities in Manageengine Servicedesk Plus

All Manageengine Servicedesk Plus vulnerabilities

Recent Unrestricted Upload of File with Dangerous Type vulnerabilities

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