Multiple integer overflows in TrueCrypt 7.1a allow local users to (1) obtain sensitive information via vectors involving a crafted item->OriginalLength value in the MainThreadProc function in EncryptedIoQueue.c or (2) cause a denial of service (memory consumption) via vectors involving large StartingOffset and Length values in the ProcessVolumeDeviceControlIrp function in Ntdriver.c.
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
| Link | Tags |
|---|---|
| https://opencryptoaudit.org/reports/iSec_Final_Open_Crypto_Audit_Project_TrueCrypt_Security_Assessment.pdf | vendor advisory |
| http://www.openwall.com/lists/oss-security/2014/04/17/7 | issue tracking mailing list |