gdm3 versions before 3.36.2 or 3.38.2 would start gnome-initial-setup if gdm3 can't contact the accountservice service via dbus in a timely manner; on Ubuntu (and potentially derivatives) this could be be chained with an additional issue that could allow a local user to create a new privileged account.

The remote Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2021:1586 advisory.

  - A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Big     Sur 11.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. Processing maliciously crafted web content may     lead to arbitrary code execution. (CVE-2021-1817)

  - A memory initialization issue was addressed with improved memory handling. This issue is fixed in macOS     Big Sur 11.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. Processing maliciously crafted web content     may result in the disclosure of process memory. (CVE-2021-1820)

  - An input validation issue was addressed with improved input validation. This issue is fixed in iTunes     12.11.3 for Windows, iCloud for Windows 12.3, macOS Big Sur 11.3, Safari 14.1, watchOS 7.4, tvOS 14.5, iOS     14.5 and iPadOS 14.5. Processing maliciously crafted web content may lead to a cross site scripting     attack. (CVE-2021-1825)

  - A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.3, iOS     14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. Processing maliciously crafted web content may lead to     universal cross site scripting. (CVE-2021-1826)

  - A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1,     iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. Processing maliciously     crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may     have been actively exploited.. (CVE-2021-30661)

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

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2021:1586 advisory.

  - The keyfile settings backend in GNOME GLib (aka glib2.0) before 2.60.0 creates directories using     g_file_make_directory_with_parents (kfsb->dir, NULL, NULL) and files using g_file_replace_contents     (kfsb->file, contents, length, NULL, FALSE, G_FILE_CREATE_REPLACE_DESTINATION, NULL, NULL, NULL).
    Consequently, it does not properly restrict directory (and file) permissions. Instead, for directories,     0777 permissions are used; for files, default file permissions are used. This is similar to     CVE-2019-12450. (CVE-2019-13012)

  - A type confusion issue was addressed with improved memory handling. This issue is fixed in Safari 14.0.
    Processing maliciously crafted web content may lead to arbitrary code execution. (CVE-2020-9948)

  - A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.0.
    Processing maliciously crafted web content may lead to arbitrary code execution. (CVE-2020-9951)

  - An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in Safari     14.0. Processing maliciously crafted web content may lead to code execution. (CVE-2020-9983)

  - A code execution vulnerability exists in the WebSocket functionality of Webkit WebKitGTK 2.30.0. A     specially crafted web page can trigger a use-after-free vulnerability which can lead to remote code     execution. An attacker can get a user to visit a webpage to trigger this vulnerability. (CVE-2020-13543)

  - An exploitable use-after-free vulnerability exists in WebKitGTK browser version 2.30.1 x64. A specially     crafted HTML web page can cause a use-after-free condition, resulting in a remote code execution. The     victim needs to visit a malicious web site to trigger this vulnerability. (CVE-2020-13584)

  - gdm3 versions before 3.36.2 or 3.38.2 would start gnome-initial-setup if gdm3 can't contact the     accountservice service via dbus in a timely manner; on Ubuntu (and potentially derivatives) this could be     be chained with an additional issue that could allow a local user to create a new privileged account.
    (CVE-2020-16125)

  - A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Big     Sur 11.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. Processing maliciously crafted web content may     lead to arbitrary code execution. (CVE-2021-1817)

  - A memory initialization issue was addressed with improved memory handling. This issue is fixed in macOS     Big Sur 11.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. Processing maliciously crafted web content     may result in the disclosure of process memory. (CVE-2021-1820)

  - An input validation issue was addressed with improved input validation. This issue is fixed in iTunes     12.11.3 for Windows, iCloud for Windows 12.3, macOS Big Sur 11.3, Safari 14.1, watchOS 7.4, tvOS 14.5, iOS     14.5 and iPadOS 14.5. Processing maliciously crafted web content may lead to a cross site scripting     attack. (CVE-2021-1825)

  - A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.3, iOS     14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. Processing maliciously crafted web content may lead to     universal cross site scripting. (CVE-2021-1826)

  - A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1,     iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. Processing maliciously     crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may     have been actively exploited.. (CVE-2021-30661)

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

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:1586 advisory.

  - glib2: insecure permissions for files and directories (CVE-2019-13012)

  - webkitgtk: type confusion may lead to arbitrary code execution (CVE-2020-9948)

  - webkitgtk: use-after-free may lead to arbitrary code execution (CVE-2020-13543, CVE-2020-13584,     CVE-2020-9951)

  - webkitgtk: out-of-bounds write may lead to code execution (CVE-2020-9983)

  - gdm: inability to timely contact accountservice via dbus leads gnome-initial-setup to creation of account     with admin privileges (CVE-2020-16125)

  - webkitgtk: Memory corruption leading to arbitrary code execution (CVE-2021-1817)

  - webkitgtk: Memory initialization issue possibly leading to memory disclosure (CVE-2021-1820)

  - webkitgtk: Input validation issue leading to cross site scripting attack (CVE-2021-1825)

  - webkitgtk: Logic issue leading to universal cross site scripting attack (CVE-2021-1826)

  - webkitgtk: Use-after-free leading to arbitrary code execution (CVE-2021-30661)

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

According to the version of the gdm package installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - gdm3 versions before 3.36.2 or 3.38.2 would start     gnome-initial-setup if gdm3 can't contact the     accountservice service via dbus in a timely manner on     Ubuntu (and potentially derivatives) this could be be     chained with an additional issue that could allow a     local user to create a new privileged     account.(CVE-2020-16125)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for gdm fixes the following issues :

  - CVE-2020-16125: Fixed a privilege escalation     (bsc#1178150).

This update was imported from the SUSE:SLE-15:Update update project.

This update for gdm fixes the following issues :

CVE-2020-16125: Fixed a privilege escalation (bsc#1178150).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for gdm fixes the following issues :

Exit with failure if loading existing users fails (bsc#1178150 CVE-2020-16125).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for gdm fixes the following issues :

  - Exit with failure if loading existing users fails     (bsc#1178150 CVE-2020-16125).

This update was imported from the SUSE:SLE-15-SP2:Update update project.

It was discovered that there was an issue in the GNOME Display Manager where not detecting any users may make GDM launch initial system setup and thereby permitting the creation of new users with sudo capabilities.

For Debian 9 'Stretch', this problem has been fixed in version 3.22.3-3+deb9u3.

We recommend that you upgrade your gdm3 packages.

For the detailed security status of gdm3 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/gdm3

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 18.04 LTS / 20.04 LTS / 20.10 host has packages installed that are affected by a vulnerability as referenced in the USN-4614-1 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
157789	Rocky Linux 8 : GNOME (RLSA-2021:1586)	Nessus	Rocky Linux Local Security Checks	high
157668	AlmaLinux 8 : GNOME (ALSA-2021:1586)	Nessus	Alma Linux Local Security Checks	high
149698	RHEL 8 : GNOME (RHSA-2021:1586)	Nessus	Red Hat Local Security Checks	high
146159	EulerOS 2.0 SP5 : gdm (EulerOS-SA-2021-1192)	Nessus	Huawei Local Security Checks	medium
145358	openSUSE Security Update : gdm (openSUSE-2020-2264)	Nessus	SuSE Local Security Checks	medium
144254	SUSE SLED15 / SLES15 Security Update : gdm (SUSE-SU-2020:3799-1)	Nessus	SuSE Local Security Checks	medium
144181	EulerOS 2.0 SP8 : gdm (EulerOS-SA-2020-2511)	Nessus	Huawei Local Security Checks	medium
143749	SUSE SLED15 / SLES15 Security Update : gdm (SUSE-SU-2020:3333-1)	Nessus	SuSE Local Security Checks	medium
143717	SUSE SLES12 Security Update : gdm (SUSE-SU-2020:3614-1)	Nessus	SuSE Local Security Checks	medium
143134	openSUSE Security Update : gdm (openSUSE-2020-1961)	Nessus	SuSE Local Security Checks	medium
142521	Debian DLA-2434-1 : gdm3 security update	Nessus	Debian Local Security Checks	medium
142369	Ubuntu 18.04 LTS / 20.04 LTS : GDM vulnerability (USN-4614-1)	Nessus	Ubuntu Local Security Checks	medium

Detections

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CVE-2020-16125

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