Vulnerability Name:

CVE-2021-26937 (CCN-196814)

Assigned:2021-02-09
Published:2021-02-09
Updated:2022-05-06
Summary:encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.
CVSS v3 Severity:9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.6 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
9.6 Critical (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H)
8.4 High (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-88
CWE-787
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-26937

Source: MLIST
Type: Exploit, Mailing List, Third Party Advisory
[oss-security] 20210210 Re: screen crash processing combining characters

Source: XF
Type: UNKNOWN
gnuscreen-cve202126937-dos(196814)

Source: MISC
Type: Product
https://ftp.gnu.org/gnu/screen/

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20210219 [SECURITY] [DLA 2570-1] screen security update

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2021-9107eeb95c

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2021-5e9894a0c5

Source: CCN
Type: GNU Web site
GNU Screen

Source: MISC
Type: Exploit, Mailing List, Vendor Advisory
https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html

Source: GENTOO
Type: Third Party Advisory
GLSA-202105-11

Source: DEBIAN
Type: Third Party Advisory
DSA-4861

Source: MISC
Type: Exploit, Mailing List, Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/02/09/3

Source: CCN
Type: oss-sec Mailing List, Wed, 10 Feb 2021 01:12:21 +0530
Re: screen crash processing combining characters

Vulnerable Configuration:Configuration 1:
  • cpe:/a:gnu:screen:*:*:*:*:*:*:*:* (Version <= 4.8.0)

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

    • Configuration 3:
  • cpe:/o:fedoraproject:fedora:32:*:*:*:*:*:*:*
  • OR cpe:/o:fedoraproject:fedora:33:*:*:*:*:*:*:*

    • Configuration RedHat 1:
  • cpe:/o:redhat:enterprise_linux:7:*:*:*:*:*:*:*

    • Configuration RedHat 2:
  • cpe:/o:redhat:enterprise_linux:7::client:*:*:*:*:*

    • Configuration RedHat 3:
  • cpe:/o:redhat:enterprise_linux:7::computenode:*:*:*:*:*

    • Configuration RedHat 4:
  • cpe:/o:redhat:enterprise_linux:7::server:*:*:*:*:*

    • Configuration RedHat 5:
  • cpe:/o:redhat:enterprise_linux:7::workstation:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:gnu:screen:4.5.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:7801
    P
    		screen-4.6.2-5.3.1 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:93152
    P
    		 (Important)
    2022-07-11
    oval:org.opensuse.security:def:93305
    P
    		 (Important)
    2022-07-06
    oval:org.opensuse.security:def:3558
    P
    		libXfont1-1.5.1-11.3.12 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3195
    P
    		libjpeg-turbo-1.5.3-31.14.2 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:94670
    P
    		libnghttp2-14-1.40.0-6.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:94825
    P
    		screen-4.6.2-5.3.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:305
    P
    		screen-4.6.2-5.3.1 on GA media (Moderate)
    2022-06-13
    oval:org.opensuse.security:def:359
    P
    		screen-4.6.2-5.3.1 on GA media (Moderate)
    2022-06-10
    oval:org.opensuse.security:def:1234
    P
    		Security update for the Linux Kernel (Important)
    2022-05-16
    oval:org.opensuse.security:def:99197
    P
    		 (Moderate)
    2022-04-01
    oval:org.opensuse.security:def:100102
    P
    		 (Moderate)
    2022-03-24
    oval:org.opensuse.security:def:101383
    P
    		memcached-1.5.6-4.5.30 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:101081
    P
    		screen-4.6.2-5.3.1 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:62323
    P
    		screen-4.6.2-5.3.1 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:72064
    P
    		screen-4.6.2-5.3.1 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:99392
    P
    		 (Important)
    2021-06-28
    oval:com.redhat.rhsa:def:20210742
    P
    		RHSA-2021:0742: screen security update (Important)
    2021-03-08
    oval:org.opensuse.security:def:111226
    P
    		Security update for screen (Important)
    2021-02-18
    oval:org.opensuse.security:def:8891
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:92641
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:93440
    P
    		 (Important)
    2021-02-17
    oval:org.opensuse.security:def:33075
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:69782
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:24019
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:58898
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:89244
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:52007
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:84722
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:9841
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:94217
    P
    		 (Important)
    2021-02-17
    oval:org.opensuse.security:def:92052
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:31342
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:21410
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:57165
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:87539
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:73769
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:82677
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:125652
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:9086
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:92840
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:93596
    P
    		 (Important)
    2021-02-17
    oval:org.opensuse.security:def:33766
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:69981
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:28937
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:59589
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:89502
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:97220
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:54760
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:85806
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:10202
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:94428
    P
    		 (Important)
    2021-02-17
    oval:org.opensuse.security:def:92247
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:31729
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:64647
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:99591
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:23175
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:57552
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:88245
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:51163
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:83232
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:126820
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:9448
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:92999
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:93791
    P
    		 (Important)
    2021-02-17
    oval:org.opensuse.security:def:34024
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:70342
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:100373
    P
    		 (Important)
    2021-02-17
    oval:org.opensuse.security:def:29470
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:59847
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:99002
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:55293
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:86193
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:10392
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:81103
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:8701
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:92442
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:32258
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:69588
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:99790
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:23744
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:58081
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:88562
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:51732
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:84264
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:127217
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:9642
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:94006
    P
    		 (Important)
    2021-02-17
    oval:org.opensuse.security:def:34628
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:70532
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:100707
    P
    		 (Important)
    2021-02-17
    oval:org.opensuse.security:def:30025
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:60451
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:108049
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:55848
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:86722
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:82144
    P
    		Security update for screen (Important)
    2021-02-17
    oval:org.opensuse.security:def:117563
    P
    		Security update for screen (Important)
    2021-02-17
    BACK
    gnu screen *
    debian debian linux 9.0
    debian debian linux 10.0
    fedoraproject fedora 32
    fedoraproject fedora 33
    gnu screen 4.5.0