Bug 1823913 (CVE-2020-11741) - CVE-2020-11741 xen: xenoprof issue allows guest OS users with active profiling to obtain sensitive information about other guests (XSA-313)
Summary: CVE-2020-11741 xen: xenoprof issue allows guest OS users with active profilin...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2020-11741
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1823914
Blocks: 1823917
TreeView+ depends on / blocked
 
Reported: 2020-04-14 19:11 UTC by Guilherme de Almeida Suckevicz
Modified: 2020-04-16 15:47 UTC (History)
22 users (show)

Fixed In Version:
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Doc Text:
A flaw was found in Xenoprof in the Xen virtual machine through version 4.13.x, where it allows guest OS users, with active profiling, to obtain sensitive information about other guests, cause a denial of service, or possibly gain privileges. For guests with “active” profiling enabled by the administrator, the Xenoprof code uses the standard Xen shared ring structure. With this flaw, the code does not treat the guest as a potential attacker, and it trusts the guest not to modify the buffer size information and not modify the head/tail pointers in unexpected ways, which can lead to a denial of service or escalation of privileges.
Clone Of:
Environment:
Last Closed: 2020-04-16 15:47:47 UTC


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Description Guilherme de Almeida Suckevicz 2020-04-14 19:11:40 UTC
An issue was discovered in xenoprof in Xen through 4.13.x, allowing guest OS users (with active profiling) to obtain sensitive information about other guests, cause a denial of service, or possibly gain privileges. For guests for which "active" profiling was enabled by the administrator, the xenoprof code uses the standard Xen shared ring structure. Unfortunately, this code did not treat the guest as a potential adversary: it trusts the guest not to modify buffer size information or modify head / tail pointers in unexpected ways. This can crash the host (DoS). Privilege escalation cannot be ruled out.

Reference:
https://xenbits.xen.org/xsa/advisory-313.html

Comment 1 Guilherme de Almeida Suckevicz 2020-04-14 19:12:00 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1823914]


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