Cyber Resilience

CVE-2023-1718

DoS in Bitrix24 22.0.300

Public PoCDoS
Published
01 November 2023
Modified
21 November 2024
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.24 98th percentile
Risk Priority 78 floored blend · peak EPSS

Summary

CVE-2023-1718 is a high-severity Infinite Loop (CWE-835) vulnerability in Bitrix24 Bitrix24. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked in the top 2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2023-1718 is an improper file stream access vulnerability in the Bitrix24 22.0.300 component located at /desktop_app/file.ajax.php?action=uploadfile. The flaw, tracked under CWE-835, permits remote manipulation of the tmp_url parameter and produces a high-impact denial-of-service condition without requiring authentication or user interaction. The issue received a CVSS 3.1 base score of 7.5 reflecting network attack vector, low complexity, and availability impact only.

Unauthenticated attackers with network access can submit a crafted tmp_url value to the affected endpoint, triggering resource exhaustion that renders the application unavailable to legitimate users. No privileges or special conditions beyond a standard HTTP request are needed for successful exploitation.

Public references point to detailed technical analysis from Star Labs but do not describe vendor patches or configuration work-arounds in the supplied data. The associated EPSS score has remained flat at 0.5115 with no material increase after disclosure.

EU & UK References

Vulnerability Data

Improper file stream access in /desktop_app/file.ajax.php?action=uploadfile in Bitrix24 22.0.300 allows unauthenticated remote attackers to cause denial-of-service via a crafted "tmp_url".

CWE(s)
CWE-835

Related Threats

MITRE ATT&CK Enterprise Techniques

T1499.004 Application or System Exploitation Impact
Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.
attack.mitre.org →
T1499 Endpoint Denial of Service Impact
Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.
attack.mitre.org →
T1499.003 Application Exhaustion Flood Impact
Adversaries may target resource intensive features of applications to cause a denial of service (DoS), denying availability to those applications.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-34887Same product: Bitrix24 Bitrix24
CVE-2024-34882Same product: Bitrix24 Bitrix24
CVE-2023-1713Same product: Bitrix24 Bitrix24
CVE-2023-1715Same product: Bitrix24 Bitrix24
CVE-2024-34885Same product: Bitrix24 Bitrix24
CVE-2023-1714Same product: Bitrix24 Bitrix24
CVE-2024-34891Same product: Bitrix24 Bitrix24
CVE-2023-1716Same product: Bitrix24 Bitrix24
CVE-2023-1719Same product: Bitrix24 Bitrix24
CVE-2023-1720Same product: Bitrix24 Bitrix24

Affected Assets

bitrix24
bitrix24
22.0.300

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

CP-7 Alternate Processing Site
addresses: CWE-835

Enables transfer to alternate site if an infinite loop at the primary renders processing unavailable.

SC-5 Denial-of-service Protection
addresses: CWE-835

Detects and mitigates infinite loops that produce sustained resource consumption.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices (reviews, testing, static analysis) directly prevent introduction of infinite-loop defects.

ID.RA-01 partial match
prevents

Static analysis and vuln scanning during asset assessment can detect unreachable loop exits.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can uncover infinite-loop conditions before release.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates practices that can detect and prevent infinite-loop defects.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify loop-termination rules, indirectly reducing the weakness.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly address loop termination and prevent infinite loops.

A.8.27 Secure system architecture and engineering principles none match
none

Secure architecture principles encourage designs that avoid unreachable exit conditions.

A.8.32 Change management none match
none

Change management can require review of loop logic when code is modified.

References