CVE-2022-27438
Published: 06 June 2022
Summary
CVE-2022-27438 is a high-severity Download of Code Without Integrity Check (CWE-494) vulnerability in Caphyon Advanced Installer. Its CVSS base score is 8.1 (High).
Operationally, ranked in the top 6.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
Caphyon Ltd Advanced Installer versions 19.3 and earlier, along with other products that incorporate its Advanced Updater component, contain a remote code execution flaw. The vulnerability is triggered through the CustomDetection parameter during the update check process and is tracked as CWE-494, indicating a failure to verify the integrity of downloaded code.
An attacker can exploit the issue by supplying a malicious response to an update check initiated by the affected software. Successful exploitation grants arbitrary code execution on the target system with the privileges of the running process; however, the attack requires the victim to launch an affected installer or application so that the update check is performed.
Vendor guidance published on the Advanced Installer security-updates page addresses remediation for the affected updater component. Organizations are advised to apply the patches or updated installer versions referenced in the advisory to eliminate the unsafe handling of the CustomDetection parameter.
EPSS scores for the CVE have remained near 0.12 with negligible change between the observed peak and current values, indicating moderate but stable exploitation interest since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-31941
Vulnerability details
Caphyon Ltd Advanced Installer 19.3 and earlier and many products that use the updater from Advanced Installer (Advanced Updater) are affected by a remote code execution vulnerability via the CustomDetection parameter in the update check function. To exploit this vulnerability,…
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a user must start an affected installation to trigger the update check.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
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.
Policies can require integrity verification of software prior to installation, reducing risks from unverified downloads.
Blocks installation of components lacking a valid signature, mitigating download or installation of code without integrity checks.
Acquisition and maintenance portions of the strategy drive requirements for integrity verification of downloaded or supplied code.
Mandating integrity control and approved-only changes during development prevents incorporation of code or components lacking integrity validation.
Supply chain protection requires integrity verification of acquired components, directly reducing insertion or tampering of malicious code during delivery.
Reduces exposure to code obtained without integrity verification by requiring assurance processes that confirm authenticity and absence of tampering.
Tamper resistance and detection commonly include integrity verification of code and firmware obtained from external sources.
Component authenticity requires verifying origin/integrity of acquired firmware or software, directly preventing inclusion of code without integrity checks.