Incorrect permission assignment for critical resource in xen (Alpine package)

1) Incorrect permission assignment for critical resource

EUVDB-ID: #VU49129

Risk: Low

CVSSv4.0: 7.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/U:Clear]

CVE-ID: CVE-2020-29479

CWE-ID: CWE-732 - Incorrect Permission Assignment for Critical Resource

Exploit availability: No

Description

The vulnerability allows a local authenticated user to execute arbitrary code.

An issue was discovered in Xen through 4.14.x. In the Ocaml xenstored implementation, the internal representation of the tree has special cases for the root node, because this node has no parent. Unfortunately, permissions were not checked for certain operations on the root node. Unprivileged guests can get and modify permissions, list, and delete the root node. (Deleting the whole xenstore tree is a host-wide denial of service.) Achieving xenstore write access is also possible. All systems using oxenstored are vulnerable. Building and using oxenstored is the default in the upstream Xen distribution, if the Ocaml compiler is available. Systems using C xenstored are not vulnerable.

Mitigation

Install update from vendor's website.

Vulnerable software versions

IBM Systems Director: 6.3.2.2

xen (Alpine package): 1.42

xen (Alpine package): 1.1.7-0ubuntu1 - 1.2.3-0ubuntu2.7

xen (Alpine package): 3.0.8-1 - 3.0.13-1

xen (Alpine package): 2:1.3.2-2ubuntu0.1

xen (Alpine package): 1:6.2.3-5

xen (Alpine package): 0.11-4

xen (Alpine package): 3.2.21-1

xen (Alpine package): 1.88-1

xen (Alpine package): 0.2.3.2-1

xen (Alpine package): 0.101 - 0.102ubuntu1

xen (Alpine package): 0.1.0-0ubuntu1 - 0.1.5-0ubuntu1

xen (Alpine package): 3.1-1 - 3.1-2

xen (Alpine package): 1.3.1-1 - 1.3.1-2

xen (Alpine package): 3.1-1

xen (Alpine package): 0.18.1.1-9ubuntu1

xen (Alpine package): 4.63-15

xen (Alpine package): 3.1.6.1-1

xen (Alpine package): 2.55-2 - 2.72-1

xen (Alpine package): 2.2.0.3-2ubuntu5

xen (Alpine package): 3.5.11.2003.06.04-3

xen (Alpine package): 5.4-2ubuntu1

xen (Alpine package): 5.4b-1

xen (Alpine package): 0.15

xen (Alpine package): 0.18ubuntu0.2 - 0.32

xen (Alpine package): 0.3.6.0amd12 - 1.12.9

xen (Alpine package): 1.9.9-3 - 1.9.10-1

xen (Alpine package): 0.48-4

xen (Alpine package): 0.9b-20040421-1 - 1.1-20120215-2

xen (Alpine package): 0.16 - 0.35

xen (Alpine package): 0.2 - 0.9

xen (Alpine package): 0.4

xen (Alpine package): 2.5.3 - 2.17.5ubuntu1

xen (Alpine package): 3.4.0-1

xen (Alpine package): 0.14-1 - 0.15-2

xen (Alpine package): 2014.1-3

xen (Alpine package): 24.0-0ubuntu1

xen (Alpine package): 0.5.2-0ubuntu1 - 1.2.5ubuntu1daily13.06.14-0ubuntu1

xen (Alpine package): 3.0-0ubuntu1

xen (Alpine package): 1.5.2 - 1.6.2

xen (Alpine package): 0.1.8 - 1.0.75

xen (Alpine package): 1.20.0 - 2.18.2

xen (Alpine package): 20081029ubuntu63 - 20101020ubuntu468

xen (Alpine package): 0.74 - 9.20160115

xen (Alpine package): 0.2.12 - 1.5.49

xen (Alpine package): 1.8.8-2ubuntu1

xen (Alpine package): 0.2.8-8 - 0.2.11-1

xen (Alpine package): 0.3 - 1.8.42

xen (Alpine package): 5.3.28-3 - 5.3.28-4

xen (Alpine package): 1.5

xen (Alpine package): 0.4.5 - 0.5.8-2.2

xen (Alpine package): 0.2.11-1build1

xen (Alpine package): 0.63

xen (Alpine package): 0.3.1-0ubuntu1 - 0.10.0-3

xen (Alpine package): 0.13-1 - 0.22.1-2

xen (Alpine package): 2.1.0-2 - 2.1.26.dfsg1-14

xen (Alpine package): 0.5.16-3.5ubuntu1 - 0.5.17-6

xen (Alpine package): 1.3-1 - 1.3-3

xen (Alpine package): 5.11-1 - 7.35.0-1

xen (Alpine package): 1.3.9-17 - 2.0.3-2

xen (Alpine package): 0.1.2-1 - 0.2.6-1ubuntu1

xen (Alpine package): 1.0.47-2 - 1.0.64-0ubuntu1

xen (Alpine package): 2.1-3-dfsg-1 - 2.1-3-dfsg-2

xen (Alpine package): 0.100-3

xen (Alpine package): 2:1.0.6-2ubuntu7 - 2:1.6.4-1

xen (Alpine package): 0.8 - 9ubuntu2

xen (Alpine package): 3.0pl1-50 - 3.0pl1-119

xen (Alpine package): 1.0.0-0ubuntu1 - 1.0.0-0ubuntu2

xen (Alpine package): expression - 7.1.1-1

xen (Alpine package): 2.8.13-7 - 2.8.13-10

xen (Alpine package): 2.4.2-16 - 2.7-1

xen (Alpine package): 0.92-0ubuntu3 - 0.98-1

xen (Alpine package): 4.5.7-1 - 8.20-3ubuntu4

xen (Alpine package): 0.2.10-3 - 0.4.6-3

xen (Alpine package): 1.5 - 1.141

xen (Alpine package): 1:0.8.6-0ubuntu4 - 1:0.9.7.6-0ubuntu2

xen (Alpine package): 0.3ubuntu7 - 0.3ubuntu15.2

xen (Alpine package): 1.2.12-1ubuntu1 - 1.2.12-1

xen (Alpine package): 0.7-svn20050721 - 1.4.29-1

xen (Alpine package): 2.8.12.1-1.6 - 3.9.0-1

xen (Alpine package): 1.0.5-2 - 1.0.8-3

xen (Alpine package): 0.25-0ubuntu1 - 0.25-0ubuntu3

xen (Alpine package): 0.9-0ubuntu1 - 0.12-0ubuntu1

xen (Alpine package): 1.4.4

xen (Alpine package): 2.2.15-1

xen (Alpine package): 1.4.2

xen (Alpine package): 4.8.9

xen (Alpine package): 3.0.4

xen (Alpine package): 2.1.0

xen (Alpine package): 1.4.17

xen (Alpine package): 2.2.0b2

xen (Alpine package): r12.0 nil

xen (Alpine package): 3.0

xen (Alpine package):

xen (Alpine package): before 4.14.1-r0

CPE2.3

• cpe:2.3:a:ibm_corporation:ibm_systems_director:6.3.2.2:*:*:*:*:*:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.42:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.1.7-0ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.2.0-0ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.2.1-0ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:3.0.8-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:3.0.13-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:2:1.3.2-2ubuntu0.1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1:6.2.3-5:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.11-4:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:3.2.21-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.88-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.2.3.2-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.101:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.1.0-0ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:3.1-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.3.1-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:3.1-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.18.1.1-9ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:4.63-15:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:3.1.6.1-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:2.55-2:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:2.2.0.3-2ubuntu5:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:3.5.11.2003.06.04-3:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:5.4-2ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:5.4b-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.15:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.18ubuntu0.2:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.3.6.0amd12:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.9.9-3:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.48-4:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.9b-20040421-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.16:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.2:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.4:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:2.5.3:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:3.4.0-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.14-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:2014.1-3:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:24.0-0ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.5.2-0ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:3.0-0ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.5.2:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.1.8:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.20.0:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:20081029ubuntu63:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.74:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.2.12:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.8.8-2ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.2.8-8:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.3:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:5.3.28-3:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.5:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.4.5:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.2.11-1build1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.63:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.3.1-0ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.13-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:2.1.0-2:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.5.16-3.5ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.3-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:5.11-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.3.9-17:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.1.2-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.0.47-2:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:2.1-3-dfsg-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.100-3:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:2:1.0.6-2ubuntu7:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.8:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:3.0pl1-50:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.0.0-0ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:expression:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:2.8.13-7:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:2.4.2-16:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.92-0ubuntu3:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:4.5.7-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.2.10-3:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.5:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1:0.8.6-0ubuntu4:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.3ubuntu7:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.2.12-1ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.7-svn20050721:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:2.8.12.1-1.6:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.0.5-2:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.25-0ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:0.9-0ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.4.4:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:2.2.15-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.4.2:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:4.8.9:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:3.0.4:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:2.1.0:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:1.4.17:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:2.2.0b2:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:3.0:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package::*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:xen_alpine_package:*:*:*:*:*:alpine_linux:*:3.12

External links

https://git.alpinelinux.org/aports/commit/?id=1f5fe5eb0e0bb4588f6b1b8b4e1563293acbb087

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.