CVE-2018-15470

An issue was discovered in Xen through 4.11.x. The logic in oxenstored for handling writes depended on the order of evaluation of expressions making up a tuple. As indicated in section 7.7.3 "Operations on data structures" of the OCaml manual, the order of evaluation of subexpressions is not specified. In practice, different implementations behave differently. Thus, oxenstored may not enforce the configured quota-maxentity. This allows a malicious or buggy guest to write as many xenstore entries as it wishes, causing unbounded memory usage in oxenstored. This can lead to a system-wide DoS.

• CVE ID
• CVE-2018-15470

• Assigner
• cve@mitre.org

• Vulnerability Status
• Modified

• Published Version
• 2018-08-17T18:29:00

• Last Modified Date
• 2018-11-13T11:29:29

• Version
• 2.0

• Vector String
• AV:L/AC:L/Au:N/C:N/I:N/A:C

• Access Vector
• LOCAL

• Access Compatibility
• LOW

• Authentication
• NONE

• Confidentiality Impact
• NONE

• Integrity Impact
• NONE

• Availability Impact
• COMPLETE

• Base Score
• 4.9

• Severity
• MEDIUM

• Exploitability Score
• 3.9

• Impact Score
• 6.9

• Version
• 3.0

• Vector String
• CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

• Attack Vector
• LOCAL

• Attack Compatibility
• LOW

• Privileges Required
• LOW

• User Interaction
• NONE

• Scope
• CHANGED

• Confidentiality Impact
• NONE

• Availability Impact
• HIGH

• Base Score
• 6.5

• Base Severity
• MEDIUM

• Exploitability Score
• 2

• Impact Score
• 4