Tightvnc
CVE-2023-27830
CRITICAL
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
1DescriptionNVD
TightVNC before v2.8.75 allows attackers to escalate privileges on the host operating system via replacing legitimate files with crafted files when executing a file transfer. This is due to the fact that TightVNC runs in the backend as a high-privileges account.
AnalysisAI
TightVNC before v2.8.75 allows attackers to escalate privileges on the host operating system via replacing legitimate files with crafted files when executing a file transfer. Rated critical severity (CVSS 9.0), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.
Technical ContextAI
This vulnerability is classified as Improper Privilege Management (CWE-269), which allows attackers to escalate privileges to gain unauthorized elevated access. TightVNC before v2.8.75 allows attackers to escalate privileges on the host operating system via replacing legitimate files with crafted files when executing a file transfer. This is due to the fact that TightVNC runs in the backend as a high-privileges account. Affected products include: Tightvnc.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply principle of least privilege, validate privilege transitions, implement proper role separation.
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TightVNC code version 1.3.10 contains global buffer overflow in HandleCoRREBBP macro function, which can potentially res
TightVNC code version 1.3.10 contains heap buffer overflow in InitialiseRFBConnection function, which can potentially re
TightVNC code version 1.3.10 contains heap buffer overflow in rfbServerCutText handler, which can potentially result cod
TightVNC code version 1.3.10 contains null pointer dereference in HandleZlibBPP function, which results Denial of System
Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
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External POC / Exploit Code
Leaving vuln.today