Security Advisory
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Security Advisory
1.0.0
Security Advisory
1. Insecure Default Secure Boot Policy for Option ROMs
2. Incorrect PKCS#1v1.5 Padding Verification for RSA Signature Check
3. UEFI Variable “Reinstallation”
4. Overwrite from Performance Data Variable
5. CommBuffer SMM Overwrite/Exposure
6. TOCTOU Issue with CommBuffer
7. SMRAM Overwrite in Fault Tolerant Write SMI Handler
8. SMRAM Overwrite in SmmVariableHandler
9. Integer/Heap Overflow in SetVariable
10. Heap Overflow in UpdateVariable
11. Overwrite from FirmwarePerformance Variable
12. Integer/Buffer Overflow in TpmDxe Driver
13. Protection of PhysicalPresence Variable
14. Boot Failure Related to UEFI Variable Usage
15. Buffer Overflows in Capsule Update
16. Boot Failure Related to TPM Measurements
17. Buffer Overflow in Variable Reclaim
18. Overflow in Processing of AuthVarKeyDatabase
19. Counter Based Authenticated Variable Issue
20. Honoring Memory Only Reset Control and correct MOR spec imlementation
21. TCG PP S4 issue
22. BIOS Password
23. OPAL driver has PP issue on BlockSid
24. OPAL driver has PSID issue
25. DHCP misses boundary check for network packet
26. SmmCore comm buffer check has TOCTOU issue
27. UEFI Variable Deletion/Corruption
28. EDK II Untested memory not covered by SMM page protection
29. Unauthenticated Firmware Chain-of-Trust Bypass
30. EDK II Authenticated Variable Bypass
31. EDK II TianoCompress Bounds Checking Issues
32. DNS Packet Size Check
33. Opal BlockSid Setting Disabled after S3
34. PartitionDxe and Udf Buffer Overflow
35. Stack Overflow on Corrupted BMP
36. Buffer Overflow in BlockIo service for RAM disk
37. XHCI stack local stack overflow
38. SW SMI Confused Deputy SmramSaveState.c
39. Unlimited FV Recursion
40. AuthVariable Timestamp Zeroing on APPEND_WRITE
41. BootGuard TOCTOU
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31. EDK II TianoCompress Bounds Checking Issues

Description:

Multiple privilege escalation vulnerabilities in TianoCompress and UEFICompress decompression algorithm may allow authenticated user to potentially manipulate stack and heap buffers via local access.

Impact

Elevation of Privilege

Severity

Medium 6.7 CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Recommendation:

This addresses the following issue in Tianocore Bugzilla: https://bugzilla.tianocore.org/show_bug.cgi?id=686​
The patch to update firmware is: https://bugzilla.tianocore.org/attachment.cgi?id=150​

Acknowledgments:

These issues were discovered by multiple parties including Intel and Eclypsium.

References:

CVE-2017-5731, CVE-2017-5732, CVE-2017-5733, CVE-2017-5734, and CVE-2017-5735
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32. DNS Packet Size Check
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