CyberSecBulletin
CVE-2023-34366NVD status: Modified

Ichitaro 2023: Use After Free

Published Updated By the CyberSecBulletin desk

CVE-2023-34366 is a high-severity use after free vulnerability in Ichitaro 2023, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. Affected Ichitaro 2023 versions: 1.0.1.59372. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.67% chance of exploitation within 30 days, higher than 53% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Check which version of Ichitaro 2023 you run against the affected versions below, and install the vendor's latest release.
  2. 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

VendorProductAffected versionsFixed in
Ichitaro 2023Ichitaro 20231.0.1.59372Not stated
JustsystemsEasy Postcard MaxNot specified in the recordNot stated
JustsystemsIchitaro 2021Not specified in the recordNot stated
JustsystemsIchitaro 2022Not specified in the recordNot stated
JustsystemsIchitaro Government 10Not specified in the recordNot stated
JustsystemsIchitaro Government 8Not specified in the recordNot stated
JustsystemsIchitaro Government 9Not specified in the recordNot stated
JustsystemsIchitaro Pro 3Not specified in the recordNot stated
JustsystemsIchitaro Pro 4Not specified in the recordNot stated
JustsystemsIchitaro Pro 5Not specified in the recordNot stated
JustsystemsJust Government 3Not specified in the recordNot stated
JustsystemsJust Government 4Not specified in the recordNot stated
JustsystemsJust Government 5Not specified in the recordNot stated
JustsystemsJust Office 3Not specified in the recordNot stated
JustsystemsJust Office 4Not specified in the recordNot stated
JustsystemsJust Office 5Not specified in the recordNot stated
JustsystemsJust Police 3Not specified in the recordNot stated
JustsystemsJust Police 4Not specified in the recordNot stated
JustsystemsJust Police 5Not specified in the recordNot 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
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
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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.17.8HighCNA (cisco.com)
CVSS 3.17.8HighNVD

Official description

A use-after-free vulnerability exists in the Figure stream parsing functionality of Ichitaro 2023 1.0.1.59372. A specially crafted document can cause memory corruption, resulting in arbitrary code execution. Victim would need to open a malicious file to trigger this vulnerability.

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

The underlying weakness: Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.

How developers prevent this class of flaw

  • Choose a language that provides automatic memory management.
  • When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.

More Use After Free vulnerabilities (CWE-416)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: total).
  3. 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 Ichitaro 2023

All Ichitaro 2023 vulnerabilities

Recent Use After Free vulnerabilities

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