CVE-2018-6854 Privilege escalation in n/a
Local attackers can exploit unsafe IOCTL handling in Sophos SafeGuard drivers to write to kernel memory, gaining SYSTEM privileges and executing arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2018-6854?
CVE-2018-6854 is a high-severity vulnerability in n/a, published on 9 Jul 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Sophos SafeGuard Enterprise before 8.00.5, SafeGuard Easy before 7.00.3, and SafeGuard LAN Crypt before 3.95.2 are vulnerable to Local Privilege Escalation via multiple IOCTLs, e.g., 0x8810200B, 0x8810200F, 0x8810201B, 0x8810201F, 0x8810202B, 0x8810202F, 0x8810203F, 0x8810204B, 0x88102003, 0x88102007, 0x88102013, 0x88102017, 0x88102027, 0x88102033, 0x88102037, 0x88102043, and 0x88102047. When some conditions in the user-controlled input buffer are not met, the driver writes an error code (0x2000001A) to a user-controlled address. Also, note that all the aforementioned IOCTLs use transfer type METHOD_NEITHER, which means that the I/O manager does not validate any of the supplied pointers and buffer sizes. So, even though the driver checks for input/output buffer sizes, it doesn't validate if the pointers to those buffers are actually valid. So, we can supply a pointer for the output buffer to a kernel address space address, and the error code will be written there. We can take advantage of this condition to modify the SEP_TOKEN_PRIVILEGES structure of the Token object belonging to the exploit process and grant SE_DEBUG_NAME privilege. This allows the exploit process to interact with higher privileged processes running as SYSTEM and execute code in their security context.
Weakness: CWE-119
Which versions are affected by CVE-2018-6854?
It affects 3 products.
Products include Sophos Safeguard Easy Device Encryption Client, Sophos Safeguard Enterprise Client, Sophos Safeguard Lan Crypt Client.
How do I fix CVE-2018-6854?
No fix has been published for CVE-2018-6854 yet. Limit exposure of the affected software until one is available.
Is CVE-2018-6854 being exploited?
There is no known exploitation of CVE-2018-6854 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-37qj-c4g3-9xvj.