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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.
    (CVE-2021-34557)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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.
    (CVE-2021-34557)

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2022:2642-1 advisory.

    - CVE-2021-34557: Fixed potential crash and unlock while disconnecting video output with more than 10     monitors (bsc#1186918)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2022:2641-1 advisory.

    - CVE-2021-34557: Fixed potential crash and unlock while disconnecting video output with more than 10     monitors (bsc#1186918)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
259426	Linux Distros Unpatched Vulnerability : CVE-2021-34557	Nessus	Misc.	medium
427541	Alpine: multiple xscreensaver packages: security update to 6.02-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
427541	Alpine: multiple xscreensaver packages: security update to 6.02-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
409876	Alpine: multiple xscreensaver packages: security update to 5.45-r0 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
409876	Alpine: multiple xscreensaver packages: security update to 5.45-r0 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
163804	SUSE SLES12 Security Update : xscreensaver (SUSE-SU-2022:2642-1)	Nessus	SuSE Local Security Checks	medium
163799	SUSE SLED15: xscreensaver / xscreensaver-data / xscreensaver-data-extra / etc (SUSE-SU-2022:2641-1)	Nessus	SuSE Local Security Checks	medium

Detections

Analytics

CVE-2021-34557

medium

Tenable Plugins

medium

medium

medium

medium

medium

medium

medium