Vulnerability Name:

CVE-2021-20181 (CCN-196606)

Assigned:2020-12-17
Published:2021-02-10
Updated:2022-09-30
Summary:A race condition flaw was found in the 9pfs server implementation of QEMU up to and including 5.2.0. This flaw allows a malicious 9p client to cause a use-after-free error, potentially escalating their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:6.9 Medium (CVSS v2 Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
6.0 Medium (CCN CVSS v2 Vector: AV:L/AC:H/Au:S/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): High
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-362
Vulnerability Consequences:Gain Privileges
References:Source: MITRE
Type: CNA
CVE-2021-20181

Source: MISC
Type: Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1927007

Source: XF
Type: UNKNOWN
qemu-cve202120181-priv-esc(196606)

Source: CCN
Type: qemu GIT Repository
9pfs: Fully restart unreclaim loop (CVE-2021-20181)

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20210218 [SECURITY] [DLA 2560-1] qemu security update

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20220905 [SECURITY] [DLA 3099-1] qemu security update

Source: CONFIRM
Type: Third Party Advisory
https://security.netapp.com/advisory/ntap-20210720-0009/

Source: CCN
Type: ZDI-21-159
QEMU Plan 9 File System Time-Of-Check Time-Of-Use Privilege Escalation Vulnerability

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-159/

Vulnerable Configuration:Configuration 1:
  • cpe:/a:qemu:qemu:*:*:*:*:*:*:*:* (Version <= 5.2.0)

    • Configuration 2:
  • cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:10.0:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:qemu:qemu:-:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:8013
    P
    		go1.19-1.19.9-150000.1.31.1 on GA media (Moderate)
    2023-06-20
    oval:org.opensuse.security:def:7791
    P
    		qemu-tools-7.1.0-150500.47.15 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:618
    P
    		Security update for python (Important) (in QA)
    2022-10-06
    oval:org.opensuse.security:def:3187
    P
    		libidn-tools-1.28-5.6.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3560
    P
    		libXi6-1.7.4-18.6.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3518
    P
    		guile-2.0.9-9.3.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:94672
    P
    		liboath-devel-2.6.2-1.15 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95148
    P
    		qemu-6.2.0-150400.35.10 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:94817
    P
    		qemu-tools-6.2.0-150400.35.10 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:296
    P
    		qemu-tools-5.2.0-9.18 on GA media (Moderate)
    2022-06-13
    oval:org.opensuse.security:def:351
    P
    		qemu-6.2.0-150400.35.10 on GA media (Moderate)
    2022-06-10
    oval:org.opensuse.security:def:113318
    P
    		qemu-6.1.0-32.1 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:5943
    P
    		Security update for mariadb (Moderate)
    2021-12-30
    oval:org.opensuse.security:def:99440
    P
    		 (Moderate)
    2021-12-06
    oval:org.opensuse.security:def:1225
    P
    		Security update for java-1_8_0-openjdk (Important)
    2021-11-23
    oval:org.opensuse.security:def:106728
    P
    		qemu-6.1.0-32.1 on GA media (Moderate)
    2021-10-01
    oval:org.opensuse.security:def:102204
    P
    		Security update for mariadb (Moderate)
    2021-09-03
    oval:org.opensuse.security:def:2279
    P
    		qemu-5.2.0-9.18 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:63368
    P
    		qemu-5.2.0-9.18 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:101385
    P
    		nut-2.7.4-4.72 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:101394
    P
    		qemu-5.2.0-9.18 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:101072
    P
    		qemu-tools-5.2.0-9.18 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:72055
    P
    		qemu-tools-5.2.0-9.18 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:62314
    P
    		qemu-tools-5.2.0-9.18 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:6284
    P
    		Security update for caribou (Important)
    2021-06-10
    oval:org.opensuse.security:def:99639
    P
    		 (Important)
    2021-06-01
    oval:org.opensuse.security:def:38198
    P
    		Security update for kvm (Important)
    2021-04-23
    oval:org.opensuse.security:def:40422
    P
    		Security update for kvm (Important)
    2021-04-23
    oval:org.opensuse.security:def:44852
    P
    		Security update for kvm (Important)
    2021-04-23
    oval:org.opensuse.security:def:29350
    P
    		Security update for qemu (Important)
    2021-04-22
    oval:org.opensuse.security:def:55173
    P
    		Security update for qemu (Important)
    2021-04-22
    oval:org.opensuse.security:def:82557
    P
    		Security update for qemu (Important)
    2021-04-22
    oval:org.opensuse.security:def:30064
    P
    		Security update for qemu (Important)
    2021-04-22
    oval:org.opensuse.security:def:55887
    P
    		Security update for qemu (Important)
    2021-04-22
    oval:org.opensuse.security:def:83271
    P
    		Security update for qemu (Important)
    2021-04-22
    oval:org.opensuse.security:def:30184
    P
    		Security update for qemu (Important)
    2021-04-22
    oval:org.opensuse.security:def:56007
    P
    		Security update for qemu (Important)
    2021-04-22
    oval:org.opensuse.security:def:83391
    P
    		Security update for qemu (Important)
    2021-04-22
    oval:org.opensuse.security:def:41466
    P
    		Security update for kvm (Important)
    2021-04-20
    oval:org.opensuse.security:def:45896
    P
    		Security update for kvm (Important)
    2021-04-20
    oval:org.opensuse.security:def:33635
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:59458
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:86535
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:125518
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:92689
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:96857
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:8935
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:69830
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:99945
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:89113
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:31607
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:57430
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:84584
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:10061
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:92096
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:99241
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:33893
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:59716
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:87362
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:126689
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:92888
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:96858
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:9307
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:70201
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:89371
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:32071
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:57894
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:85616
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:23550
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:51538
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:10241
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:92291
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:8562
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:69447
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:34409
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:60232
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:88102
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:127086
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:93041
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:9491
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:70381
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:98851
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:32898
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:58721
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:86071
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:23885
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:51873
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:92490
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:8740
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:69631
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:88414
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:31152
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:56975
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:84127
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:93194
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:9690
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:91901
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:99046
    P
    		Security update for qemu (Important)
    2021-04-16
    oval:org.opensuse.security:def:111243
    P
    		Security update for qemu (Important)
    2021-03-01
    oval:org.opensuse.security:def:108870
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:73771
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:69102
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:109450
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:76100
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:64649
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:95491
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:117565
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:76441
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:97224
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:67032
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:96094
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:118546
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:108051
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:102784
    P
    		Security update for qemu (Important)
    2021-02-19
    oval:org.opensuse.security:def:67373
    P
    		Security update for qemu (Important)
    2021-02-19
    BACK
    qemu qemu *
    debian debian linux 9.0
    debian debian linux 10.0
    qemu qemu -