CVE-2021-34557

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-34557
XScreenSaver 5.45 can be bypassed if the machine has more than ten disconnectable video outputs. A buffer overflow in update_screen_layout() allows an attacker to bypass the standard screen lock authentication mechanism by crashing XScreenSaver. The attacker must physically disconnect many video outputs.

4.6 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 0.9 / Impact : 3.6

Attack Vector PHYSICAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

2.1 /10

CVSS v2.0 : LOW

V2 Legend

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

Exploitability : 3.9 / Impact : 2.9

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References
Link Resource
http://www.openwall.com/lists/oss-security/2021/06/11/1 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/07/06/2 Exploit Mailing List Third Party Advisory
https://github.com/QubesOS/qubes-issues/issues/6595 Issue Tracking Third Party Advisory
https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt Exploit Third Party Advisory
https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch Patch Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/
https://www.openwall.com/lists/oss-security/2021/06/05/1 Exploit Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/06/11/1 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/07/06/2 Exploit Mailing List Third Party Advisory
https://github.com/QubesOS/qubes-issues/issues/6595 Issue Tracking Third Party Advisory
https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt Exploit Third Party Advisory
https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch Patch Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/
https://www.openwall.com/lists/oss-security/2021/06/05/1 Exploit Mailing List Third Party Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:xscreensaver_project:xscreensaver:5.45:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
History

21 Nov 2024, 06:10

Type Values Removed Values Added
References () http://www.openwall.com/lists/oss-security/2021/06/11/1 - Mailing List, Third Party Advisory () http://www.openwall.com/lists/oss-security/2021/06/11/1 - Mailing List, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2021/07/06/2 - Exploit, Mailing List, Third Party Advisory () http://www.openwall.com/lists/oss-security/2021/07/06/2 - Exploit, Mailing List, Third Party Advisory
References () https://github.com/QubesOS/qubes-issues/issues/6595 - Issue Tracking, Third Party Advisory () https://github.com/QubesOS/qubes-issues/issues/6595 - Issue Tracking, Third Party Advisory
References () https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt - Exploit, Third Party Advisory () https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt - Exploit, Third Party Advisory
References () https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch - Patch, Third Party Advisory () https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch - Patch, Third Party Advisory
References () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/ - () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/ -
References () https://www.openwall.com/lists/oss-security/2021/06/05/1 - Exploit, Mailing List, Third Party Advisory () https://www.openwall.com/lists/oss-security/2021/06/05/1 - Exploit, Mailing List, Third Party Advisory

21 Sep 2021, 16:39

Type Values Removed Values Added
CPE cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
References (MLIST) http://www.openwall.com/lists/oss-security/2021/07/06/2 - (MLIST) http://www.openwall.com/lists/oss-security/2021/07/06/2 - Exploit, Mailing List, Third Party Advisory
References (FEDORA) https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/ - (FEDORA) https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/ - Mailing List, Third Party Advisory

19 Aug 2021, 03:15

Type Values Removed Values Added
References
  • (MLIST) http://www.openwall.com/lists/oss-security/2021/07/06/2 -
  • (FEDORA) https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/ -

22 Jun 2021, 10:42

Type Values Removed Values Added
CPE cpe:2.3:a:xscreensaver_project:xscreensaver:5.45:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : 2.1
v3 : 4.6
CWE CWE-120
References (MLIST) http://www.openwall.com/lists/oss-security/2021/06/11/1 - (MLIST) http://www.openwall.com/lists/oss-security/2021/06/11/1 - Mailing List, Third Party Advisory
References (MISC) https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt - (MISC) https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt - Exploit, Third Party Advisory
References (MISC) https://github.com/QubesOS/qubes-issues/issues/6595 - (MISC) https://github.com/QubesOS/qubes-issues/issues/6595 - Issue Tracking, Third Party Advisory
References (MISC) https://www.openwall.com/lists/oss-security/2021/06/05/1 - (MISC) https://www.openwall.com/lists/oss-security/2021/06/05/1 - Exploit, Mailing List, Third Party Advisory
References (MISC) https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch - (MISC) https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch - Patch, Third Party Advisory

11 Jun 2021, 15:15

Type Values Removed Values Added
References
  • (MLIST) http://www.openwall.com/lists/oss-security/2021/06/11/1 -

10 Jun 2021, 16:28

Type Values Removed Values Added
New CVE
Information

Published : 2021-06-10 16:15

Updated : 2024-11-21 06:10

NVD link : CVE-2021-34557

Mitre link : CVE-2021-34557

CVE.ORG link : CVE-2021-34557

JSON object : View

Products Affected

xscreensaver_project

  • xscreensaver

fedoraproject

  • fedora
CWE
CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')