CVE-2018-6854

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.

Published : 2018-07-09 18:29 Updated : 2019-10-03 00:03

7.2
CVSS Score More info
Score 7.2 / 10
7.2
Vendor Product Version URI
Sophos Safeguard Easy Device Encryption Client 6.00 cpe:/a:sophos:safeguard_easy_device_encryption_client:6.00
Sophos Safeguard Easy Device Encryption Client 6.10 cpe:/a:sophos:safeguard_easy_device_encryption_client:6.10
Sophos Safeguard Easy Device Encryption Client 7.00 cpe:/a:sophos:safeguard_easy_device_encryption_client:7.00
Sophos Safeguard Enterprise Client 5.60.3 cpe:/a:sophos:safeguard_enterprise_client:5.60.3:vs-nfd
Sophos Safeguard Enterprise Client 6.00 cpe:/a:sophos:safeguard_enterprise_client:6.00
Sophos Safeguard Enterprise Client 6.00.1 cpe:/a:sophos:safeguard_enterprise_client:6.00.1
Sophos Safeguard Enterprise Client 6.10 cpe:/a:sophos:safeguard_enterprise_client:6.10
Sophos Safeguard Enterprise Client 7.00 cpe:/a:sophos:safeguard_enterprise_client:7.00
Sophos Safeguard Enterprise Client 8.00 cpe:/a:sophos:safeguard_enterprise_client:8.00
Sophos Safeguard Lan Crypt Client 3.90.1 cpe:/a:sophos:safeguard_lan_crypt_client:3.90.1:ts
Sophos Safeguard Lan Crypt Client 3.90.2 cpe:/a:sophos:safeguard_lan_crypt_client:3.90.2
Sophos Safeguard Lan Crypt Client 3.95.1 cpe:/a:sophos:safeguard_lan_crypt_client:3.95.1
Sophos Safeguard Lan Crypt Client 3.95.1 cpe:/a:sophos:safeguard_lan_crypt_client:3.95.1:ts
  1. Sophos (3) Search CVE
    1. Safeguard Enterprise Client (6) Search CVE
      1. 5.60.3
      2. 6.00
      3. 6.00.1
      4. 6.10
      5. 7.00
      6. 8.00
    2. Safeguard Easy Device Encryption Client (3) Search CVE
      1. 6.00
      2. 6.10
      3. 7.00
    3. Safeguard Lan Crypt Client (3) Search CVE
      1. 3.90.1
      2. 3.90.2
      3. 3.95.1

CWE

ID Name Description Links
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. CVE

History of changes

Date Event
2019-10-03 00:03
2018-09-07 15:40
2018-07-09 18:29

New CVE