Vulnerability Name:

CCN-12940

Published:2003-08-17
Updated:2003-08-17
Summary:Unix operating systems could be vulnerable to keystroke timing attacks, caused by the /dev/random device. The /dev/random estimates the amount of entropy in the entropy pool and will not allow read when the entropy pool is empty. When the pool is seeded with new data, the /dev/random device lifts the read block. A local attacker monitoring the /dev/random device could exploit this vulnerability to measure keystroke timing and other types of events occurring on the system, and possibly determine algorithm information.
CVSS v3 Severity:4.0 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
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): Low
Integrity (I): None
Availibility (A): None
CVSS v2 Severity:2.1 Low (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:P/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
Vulnerability Consequences:Obtain Information
References:Source: CCN
Type: SecuriTeam Mailing List, SecurityNews 17 Aug 2003
UNIX Entropy Source Can Be Used For Keystroke Timing Attacks

Source: CCN
Type: BID-8425
Unix/Linux Keystroke Information Disclosure Weakness

Source: XF
Type: UNKNOWN
unix-devrandom-keystroke-timing(12940)

Vulnerable Configuration:Configuration CCN 1:
  • cpe:/o:unix:unix:*:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    unix unix *