Vulnerability Name:

CVE-2018-6854 (CCN-145451)

Assigned:2018-06-25
Published:2018-06-25
Updated:2019-10-03
Summary: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.
CVSS v3 Severity:7.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
8.4 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
7.3 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:7.2 High (CVSS v2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
7.2 High (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-119
Vulnerability Consequences:Gain Privileges
References:Source: MITRE
Type: CNA
CVE-2018-6854

Source: FULLDISC
Type: Mailing List, Third Party Advisory
20180706 Sophos Safeguard Products - Multiple Privilege Escalation Vulnerabilities.

Source: CCN
Type: Sophos Knowledge Base 131934
Windows Client Patch 1804 for SafeGuard products

Source: CONFIRM
Type: Patch, Vendor Advisory
https://community.sophos.com/kb/en-us/131934

Source: XF
Type: UNKNOWN
sophos-safeguard-cve20186854-priv-esc(145451)

Source: CCN
Type: Nettitude Labs Web site
CVE-2018-6851 to CVE-2018-6857: Sophos Privilege Escalation Vulnerabilities

Source: MISC
Type: Exploit, Technical Description, Third Party Advisory
https://labs.nettitude.com/blog/cve-2018-6851-to-cve-2018-6857-sophos-privilege-escalation-vulnerabilities/

Vulnerable Configuration:Configuration 1:
  • cpe:/a:sophos:safeguard_easy_device_encryption_client:6.00:*:*:*:*:*:*:*
  • OR cpe:/a:sophos:safeguard_easy_device_encryption_client:6.10:*:*:*:*:*:*:*
  • OR cpe:/a:sophos:safeguard_easy_device_encryption_client:7.00:*:*:*:*:*:*:*
  • OR cpe:/a:sophos:safeguard_enterprise_client:5.60.3:vs-nfd:*:*:*:*:*:*
  • OR cpe:/a:sophos:safeguard_enterprise_client:6.00:*:*:*:*:*:*:*
  • OR cpe:/a:sophos:safeguard_enterprise_client:6.00.1:*:*:*:*:*:*:*
  • OR cpe:/a:sophos:safeguard_enterprise_client:6.10:*:*:*:*:*:*:*
  • OR cpe:/a:sophos:safeguard_enterprise_client:7.00:*:*:*:*:*:*:*
  • OR cpe:/a:sophos:safeguard_enterprise_client:8.00:*:*:*:*:*:*:*
  • OR cpe:/a:sophos:safeguard_lan_crypt_client:3.90.1:ts:*:*:*:*:*:*
  • OR cpe:/a:sophos:safeguard_lan_crypt_client:3.90.2:*:*:*:*:*:*:*
  • OR cpe:/a:sophos:safeguard_lan_crypt_client:3.95.1:*:*:*:*:*:*:*
  • OR cpe:/a:sophos:safeguard_lan_crypt_client:3.95.1:ts:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    sophos safeguard easy device encryption client 6.00
    sophos safeguard easy device encryption client 6.10
    sophos safeguard easy device encryption client 7.00
    sophos safeguard enterprise client 5.60.3 vs-nfd
    sophos safeguard enterprise client 6.00
    sophos safeguard enterprise client 6.00.1
    sophos safeguard enterprise client 6.10
    sophos safeguard enterprise client 7.00
    sophos safeguard enterprise client 8.00
    sophos safeguard lan crypt client 3.90.1 ts
    sophos safeguard lan crypt client 3.90.2
    sophos safeguard lan crypt client 3.95.1
    sophos safeguard lan crypt client 3.95.1 ts