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Xen ProjectXSA-330

HistoryDec 15, 2020 - 12:00 p.m.

oxenstored memory leak in reset_watches

2020-12-1512:00:00

Xen Project

xenbits.xen.org

4.9 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:N/I:N/A:C

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

0.0004 Low

EPSS

Percentile

5.1%

JSON

ISSUE DESCRIPTION

When acting upon a guest XS_RESET_WATCHES request, not all tracking information is freed.

IMPACT

A guest can cause unbounded memory usage in oxenstored. This can lead to a system-wide DoS.

VULNERABLE SYSTEMS

All version of Xen since 4.6 are vulnerable.
Only systems using the Ocaml Xenstored implementation are vulnerable. Systems using the C Xenstored implementaion are not vulnerable.

4.9 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:N/I:N/A:C

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

0.0004 Low

EPSS

Percentile

5.1%

JSON

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