CyberSecBulletin
CVE-2023-45159NVD status: Modified

1E Client: Improper Link Resolution Before File Access

Published Updated By the CyberSecBulletin desk

CVE-2023-45159 is a high-severity improper link resolution before file access vulnerability in 1E Client from 1E, with a CVSS 3.1 base score of 8.4 out of 10. It can be exploited with local access to the system by an unauthenticated attacker, without any action from a user. The record lists versions 8.1.2.62, 8.4.1.159, 9.0.1.88 as the first without the flaw, so updating 1E Client to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.23% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update 1E Client to 8.1.2.62 or 8.4.1.159 or 9.0.1.88 or 23.7.1.151, whichever matches your release line, or a later version.
  2. Update client to 8.1.2.62 or 8.4.1.159 or 9.0.1.88 or 23.7.1.151, whichever matches your release line, or a later version.
  3. Read the advisory on teamviewer.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
1E1E Clientbefore 8.1.2.62; before 8.4.1.159; before 9.0.1.88; before 23.7.1.1518.1.2.62, 8.4.1.159, 9.0.1.88, 23.7.1.151
1eclientbefore 8.1.2.62; before 8.4.1.159; before 9.0.1.88; before 23.7.1.1518.1.2.62, 8.4.1.159, 9.0.1.88, 23.7.1.151

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
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
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:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.18.4HighCNA (1e.com)
CVSS 3.18.4HighNVD

Official description

1E Client installer can perform arbitrary file deletion on protected files. A non-privileged user could provide a symbolic link or Windows junction to point to a protected directory in the installer that the 1E Client would then clear on service startup. A hotfix is available from the 1E support portal that forces the 1E Client to check for a symbolic link or junction and if it finds one refuses to use that path and instead creates a path involving a random GUID. for v8.1 use hotfix Q23097 for v8.4 use hotfix Q23105 for v9.0 use hotfix Q23115 for SaaS customers, use 1EClient v23.7 plus hotfix Q23121

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Link Resolution Before File Access

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.

How developers prevent this class of flaw

  • Follow the principle of least privilege when assigning access rights to entities in a software system. Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

More Improper Link Resolution Before File Access vulnerabilities (CWE-59)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in 1E Client

All 1E Client vulnerabilities

Recent Improper Link Resolution Before File Access vulnerabilities

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