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An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.
Publish Date : 2018-06-22 Last Update Date : 2018-08-21
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CVSS Scores & Vulnerability Types
| CVSS Score |
6.3 |
| Confidentiality Impact |
Complete
(There is total information disclosure, resulting in all system files being revealed.) |
| Integrity Impact |
None
(There is no impact to the integrity of the system) |
| Availability Impact |
Complete
(There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.) |
| Access Complexity |
Medium
(The access conditions are somewhat specialized. Some preconditions must be satistified to exploit) |
| Authentication |
Not required
(Authentication is not required to exploit the vulnerability.) |
| Gained Access |
None |
| Vulnerability Type(s) |
Denial Of ServiceObtain Information |
| CWE ID |
362 |
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Products Affected By CVE-2018-12633
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Number Of Affected Versions By Product
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References For CVE-2018-12633
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Metasploit Modules Related To CVE-2018-12633
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