Strix
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CVE-2018-6855

UnknownEPSS 0.54%

Last modified

CVE-2018-6855 is a vulnerability of currently unknown severity. 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 IOCTL 0x80202014. By crafting an input buffer we can control the execution path to the point where the constant 0xFFFFFFF will be written to a user-controlled address. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

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 IOCTL 0x80202014. By crafting an input buffer we can control the execution path to the point where the constant 0xFFFFFFF will be written to a user-controlled address. 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.

Metrics

EPSS Probability
0.54%

41.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
SophosSafeguard Easy Device Encryption Client6.00—
SophosSafeguard Easy Device Encryption Client6.10—
SophosSafeguard Easy Device Encryption Client7.00—
SophosSafeguard Enterprise Client5.60.3Vs-Nfd
SophosSafeguard Enterprise Client6.00—
SophosSafeguard Enterprise Client6.00.1—
SophosSafeguard Enterprise Client6.10—
SophosSafeguard Enterprise Client7.00—
SophosSafeguard Enterprise Client8.00—
SophosSafeguard Lan Crypt Client3.90.1Ts
SophosSafeguard Lan Crypt Client3.90.2—
SophosSafeguard Lan Crypt Client3.95.1—

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2018-6855?
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 IOCTL 0x80202014. By crafting an input buffer we can control the execution path to the point where the constant 0xFFFFFFF will be written to a user-controlled address. 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.
How severe is CVE-2018-6855?
Severity scoring for CVE-2018-6855 is pending analysis. The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.
How do I fix CVE-2018-6855?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-6855?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST