Systemdproject Systemd

An issue was discovered in systemd 253

CVE-2023-31439 5.3 - Medium - June 13, 2023

An issue was discovered in systemd 253. An attacker can modify the contents of past events in a sealed log file and then adjust the file such that checking the integrity shows no error, despite modifications. NOTE: the vendor reportedly sent "a reply denying that any of the finding was a security vulnerability."

Improper Validation of Integrity Check Value

An issue was discovered in systemd 253

CVE-2023-31438 5.3 - Medium - June 13, 2023

An issue was discovered in systemd 253. An attacker can truncate a sealed log file and then resume log sealing such that checking the integrity shows no error, despite modifications. NOTE: the vendor reportedly sent "a reply denying that any of the finding was a security vulnerability."

Improper Validation of Integrity Check Value

An issue was discovered in systemd 253

CVE-2023-31437 5.3 - Medium - June 13, 2023

An issue was discovered in systemd 253. An attacker can modify a sealed log file such that, in some views, not all existing and sealed log messages are displayed. NOTE: the vendor reportedly sent "a reply denying that any of the finding was a security vulnerability."

Improper Validation of Integrity Check Value

systemd before 247 does not adequately block local privilege escalation for some Sudo configurations, e.g

CVE-2023-26604 7.8 - High - March 03, 2023

systemd before 247 does not adequately block local privilege escalation for some Sudo configurations, e.g., plausible sudoers files in which the "systemctl status" command may be executed. Specifically, systemd does not set LESSSECURE to 1, and thus other programs may be launched from the less program. This presents a substantial security risk when running systemctl from Sudo, because less executes as root when the terminal size is too small to show the complete systemctl output.

A vulnerability was found in systemd

CVE-2022-4415 5.5 - Medium - January 11, 2023

A vulnerability was found in systemd. This security flaw can cause a local information leak due to systemd-coredump not respecting the fs.suid_dumpable kernel setting.

systemd 250 and 251 allows local users to achieve a systemd-coredump deadlock by triggering a crash that has a long backtrace

CVE-2022-45873 5.5 - Medium - November 23, 2022

systemd 250 and 251 allows local users to achieve a systemd-coredump deadlock by triggering a crash that has a long backtrace. This occurs in parse_elf_object in shared/elf-util.c. The exploitation methodology is to crash a binary calling the same function recursively, and put it in a deeply nested directory to make its backtrace large enough to cause the deadlock. This must be done 16 times when MaxConnections=16 is set for the systemd/units/systemd-coredump.socket file.

Resource Exhaustion

An off-by-one Error issue was discovered in Systemd in format_timespan() function of time-util.c

CVE-2022-3821 5.5 - Medium - November 08, 2022

An off-by-one Error issue was discovered in Systemd in format_timespan() function of time-util.c. An attacker could supply specific values for time and accuracy that leads to buffer overrun in format_timespan(), leading to a Denial of Service.

A use-after-free vulnerability was found in systemd

CVE-2022-2526 9.8 - Critical - September 09, 2022

A use-after-free vulnerability was found in systemd. This issue occurs due to the on_stream_io() function and dns_stream_complete() function in 'resolved-dns-stream.c' not incrementing the reference counting for the DnsStream object. Therefore, other functions and callbacks called can dereference the DNSStream object, causing the use-after-free when the reference is still used later.

Dangling pointer

A flaw was found in systemd

CVE-2021-3997 5.5 - Medium - August 23, 2022

A flaw was found in systemd. An uncontrolled recursion in systemd-tmpfiles may lead to a denial of service at boot time when too many nested directories are created in /tmp.

Stack Exhaustion

basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker)

CVE-2021-33910 5.5 - Medium - July 20, 2021

basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system crash.

Allocation of Resources Without Limits or Throttling

An exploitable denial-of-service vulnerability exists in Systemd 245

CVE-2020-13529 6.1 - Medium - May 10, 2021

An exploitable denial-of-service vulnerability exists in Systemd 245. A specially crafted DHCP FORCERENEW packet can cause a server running the DHCP client to be vulnerable to a DHCP ACK spoofing attack. An attacker can forge a pair of FORCERENEW and DCHP ACK packets to reconfigure the server.

Authentication Bypass by Spoofing

systemd through v245 mishandles numerical usernames such as ones composed of decimal digits or 0x followed by hex digits

CVE-2020-13776 6.7 - Medium - June 03, 2020

systemd through v245 mishandles numerical usernames such as ones composed of decimal digits or 0x followed by hex digits, as demonstrated by use of root privileges when privileges of the 0x0 user account were intended. NOTE: this issue exists because of an incomplete fix for CVE-2017-1000082.

Improper Privilege Management

A heap use-after-free vulnerability was found in systemd before version v245-rc1

CVE-2020-1712 7.8 - High - March 31, 2020

A heap use-after-free vulnerability was found in systemd before version v245-rc1, where asynchronous Polkit queries are performed while handling dbus messages. A local unprivileged attacker can abuse this flaw to crash systemd services or potentially execute code and elevate their privileges, by sending specially crafted dbus messages.

Dangling pointer

systemd 37-1 does not properly handle non-existent services

CVE-2012-1101 5.5 - Medium - March 11, 2020

systemd 37-1 does not properly handle non-existent services, which causes a denial of service (failure of login procedure).

An issue was discovered in button_open in login/logind-button.c in systemd before 243

CVE-2019-20386 2.4 - Low - January 21, 2020

An issue was discovered in button_open in login/logind-button.c in systemd before 243. When executing the udevadm trigger command, a memory leak may occur.

Memory Leak

systemd 239 through 245 accepts any certificate signed by a trusted certificate authority for DNS Over TLS

CVE-2018-21029 9.8 - Critical - October 30, 2019

systemd 239 through 245 accepts any certificate signed by a trusted certificate authority for DNS Over TLS. Server Name Indication (SNI) is not sent, and there is no hostname validation with the GnuTLS backend. NOTE: This has been disputed by the developer as not a vulnerability since hostname validation does not have anything to do with this issue (i.e. there is no hostname to be sent)

Improper Certificate Validation

In systemd 240, bus_open_system_watch_bind_with_description in shared/bus-util.c (as used by systemd-resolved to connect to the system D-Bus instance), calls sd_bus_set_trusted

CVE-2019-15718 4.4 - Medium - September 04, 2019

In systemd 240, bus_open_system_watch_bind_with_description in shared/bus-util.c (as used by systemd-resolved to connect to the system D-Bus instance), calls sd_bus_set_trusted, which disables access controls for incoming D-Bus messages. An unprivileged user can exploit this by executing D-Bus methods that should be restricted to privileged users, in order to change the system's DNS resolver settings.

systemd 242 changes the VT1 mode upon a logout, which

CVE-2018-20839 9.8 - Critical - May 17, 2019

systemd 242 changes the VT1 mode upon a logout, which allows attackers to read cleartext passwords in certain circumstances, such as watching a shutdown, or using Ctrl-Alt-F1 and Ctrl-Alt-F2. This occurs because the KDGKBMODE (aka current keyboard mode) check is mishandled.

Information Disclosure

It was discovered that a systemd service that uses DynamicUser property can get new privileges through the execution of SUID binaries, which would

CVE-2019-3844 7.8 - High - April 26, 2019

It was discovered that a systemd service that uses DynamicUser property can get new privileges through the execution of SUID binaries, which would allow to create binaries owned by the service transient group with the setgid bit set. A local attacker may use this flaw to access resources that will be owned by a potentially different service in the future, when the GID will be recycled.

Privilege Chaining

It was discovered that a systemd service that uses DynamicUser property can create a SUID/SGID binary that would be

CVE-2019-3843 7.8 - High - April 26, 2019

It was discovered that a systemd service that uses DynamicUser property can create a SUID/SGID binary that would be allowed to run as the transient service UID/GID even after the service is terminated. A local attacker may use this flaw to access resources that will be owned by a potentially different service in the future, when the UID/GID will be recycled.

Improper Privilege Management

In systemd before v242-rc4, it was discovered

CVE-2019-3842 7 - High - April 09, 2019

In systemd before v242-rc4, it was discovered that pam_systemd does not properly sanitize the environment before using the XDG_SEAT variable. It is possible for an attacker, in some particular configurations, to set a XDG_SEAT environment variable which allows for commands to be checked against polkit policies using the "allow_active" element rather than "allow_any".

AuthZ

An issue was discovered in sd-bus in systemd 239

CVE-2019-6454 5.5 - Medium - March 21, 2019

An issue was discovered in sd-bus in systemd 239. bus_process_object() in libsystemd/sd-bus/bus-objects.c allocates a variable-length stack buffer for temporarily storing the object path of incoming D-Bus messages. An unprivileged local user can exploit this by sending a specially crafted message to PID1, causing the stack pointer to jump over the stack guard pages into an unmapped memory region and trigger a denial of service (systemd PID1 crash and kernel panic).

Memory Corruption

It was discovered systemd does not correctly check the content of PIDFile files before using it to kill processes

CVE-2018-16888 4.7 - Medium - January 14, 2019

It was discovered systemd does not correctly check the content of PIDFile files before using it to kill processes. When a service is run from an unprivileged user (e.g. User field set in the service file), a local attacker who is able to write to the PIDFile of the mentioned service may use this flaw to trick systemd into killing other services and/or privileged processes. Versions before v237 are vulnerable.

Improper Privilege Management

An allocation of memory without limits

CVE-2018-16865 7.8 - High - January 11, 2019

An allocation of memory without limits, that could result in the stack clashing with another memory region, was discovered in systemd-journald when many entries are sent to the journal socket. A local attacker, or a remote one if systemd-journal-remote is used, may use this flaw to crash systemd-journald or execute code with journald privileges. Versions through v240 are vulnerable.

Allocation of Resources Without Limits or Throttling

An allocation of memory without limits

CVE-2018-16864 7.8 - High - January 11, 2019

An allocation of memory without limits, that could result in the stack clashing with another memory region, was discovered in systemd-journald when a program with long command line arguments calls syslog. A local attacker may use this flaw to crash systemd-journald or escalate his privileges. Versions through v240 are vulnerable.

Allocation of Resources Without Limits or Throttling

An out of bounds read was discovered in systemd-journald in the way it parses log messages that terminate with a colon ':'

CVE-2018-16866 3.3 - Low - January 11, 2019

An out of bounds read was discovered in systemd-journald in the way it parses log messages that terminate with a colon ':'. A local attacker can use this flaw to disclose process memory data. Versions from v221 to v239 are vulnerable.

Information Disclosure

A vulnerability in unit_deserialize of systemd allows an attacker to supply arbitrary state across systemd re-execution via NotifyAccess

CVE-2018-15686 7.8 - High - October 26, 2018

A vulnerability in unit_deserialize of systemd allows an attacker to supply arbitrary state across systemd re-execution via NotifyAccess. This can be used to improperly influence systemd execution and possibly lead to root privilege escalation. Affected releases are systemd versions up to and including 239.

Marshaling, Unmarshaling

A buffer overflow vulnerability in the dhcp6 client of systemd allows a malicious dhcp6 server to overwrite heap memory in systemd-networkd

CVE-2018-15688 8.8 - High - October 26, 2018

A buffer overflow vulnerability in the dhcp6 client of systemd allows a malicious dhcp6 server to overwrite heap memory in systemd-networkd. Affected releases are systemd: versions up to and including 239.

Classic Buffer Overflow

A race condition in chown_one() of systemd allows an attacker to cause systemd to set arbitrary permissions on arbitrary files

CVE-2018-15687 7 - High - October 26, 2018

A race condition in chown_one() of systemd allows an attacker to cause systemd to set arbitrary permissions on arbitrary files. Affected releases are systemd versions up to and including 239.

Race Condition

In systemd prior to 234 a race condition exists between .mount and .automount units such

CVE-2018-1049 5.9 - Medium - February 16, 2018

In systemd prior to 234 a race condition exists between .mount and .automount units such that automount requests from kernel may not be serviced by systemd resulting in kernel holding the mountpoint and any processes that try to use said mount will hang. A race condition like this may lead to denial of service, until mount points are unmounted.

Race Condition

systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under

CVE-2018-6954 7.8 - High - February 13, 2018

systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.

insecure temporary file

systemd-tmpfiles in systemd before 237 attempts to support ownership/permission changes on hardlinked files even if the fs.protected_hardlinks sysctl is turned off, which

CVE-2017-18078 7.8 - High - January 29, 2018

systemd-tmpfiles in systemd before 237 attempts to support ownership/permission changes on hardlinked files even if the fs.protected_hardlinks sysctl is turned off, which allows local users to bypass intended access restrictions via vectors involving a hard link to a file for which the user lacks write access, as demonstrated by changing the ownership of the /etc/passwd file.

insecure temporary file

In systemd 223 through 235, a remote DNS server can respond with a custom crafted DNS NSEC resource record to trigger an infinite loop in the dns_packet_read_type_window() function of the 'systemd-resolved' service

CVE-2017-15908 7.5 - High - October 26, 2017

In systemd 223 through 235, a remote DNS server can respond with a custom crafted DNS NSEC resource record to trigger an infinite loop in the dns_packet_read_type_window() function of the 'systemd-resolved' service and cause a DoS of the affected service.

Infinite Loop

Stack-based buffer overflow in the getpwnam and getgrnam functions of the NSS module nss-mymachines in systemd.

CVE-2015-7510 9.8 - Critical - September 25, 2017

Stack-based buffer overflow in the getpwnam and getgrnam functions of the NSS module nss-mymachines in systemd.

Buffer Overflow

systemd v233 and earlier fails to safely parse usernames starting with a numeric digit (e.g

CVE-2017-1000082 9.8 - Critical - July 07, 2017

systemd v233 and earlier fails to safely parse usernames starting with a numeric digit (e.g. "0day"), running the service in question with root privileges rather than the user intended.

Improper Privilege Management

In systemd through 233, certain sizes passed to dns_packet_new in systemd-resolved can cause it to allocate a buffer that's too small

CVE-2017-9445 7.5 - High - June 28, 2017

In systemd through 233, certain sizes passed to dns_packet_new in systemd-resolved can cause it to allocate a buffer that's too small. A malicious DNS server can exploit this via a response with a specially crafted TCP payload to trick systemd-resolved into allocating a buffer that's too small, and subsequently write arbitrary data beyond the end of it.

Memory Corruption

systemd-resolved through 233

CVE-2017-9217 7.5 - High - May 24, 2017

systemd-resolved through 233 allows remote attackers to cause a denial of service (daemon crash) via a crafted DNS response with an empty question section.

NULL Pointer Dereference

The manager_dispatch_notify_fd function in systemd

CVE-2016-7796 5.5 - Medium - October 13, 2016

The manager_dispatch_notify_fd function in systemd allows local users to cause a denial of service (system hang) via a zero-length message received over a notify socket, which causes an error to be returned and the notification handler to be disabled.

Improper Input Validation

The session_link_x11_socket function in login/logind-session.c in systemd-logind in systemd, possibly 37 and earlier

CVE-2012-0871 - April 18, 2014

The session_link_x11_socket function in login/logind-session.c in systemd-logind in systemd, possibly 37 and earlier, allows local users to create or overwrite arbitrary files via a symlink attack on the X11 user directory in /run/user/.

insecure temporary file

Integer overflow in the valid_user_field function in journal/journald-native.c in systemd

CVE-2013-4391 - October 28, 2013

Integer overflow in the valid_user_field function in journal/journald-native.c in systemd allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a large journal data field, which triggers a heap-based buffer overflow.

Integer Overflow or Wraparound

systemd, when updating file permissions

CVE-2013-4392 - October 28, 2013

systemd, when updating file permissions, allows local users to change the permissions and SELinux security contexts for arbitrary files via a symlink attack on unspecified files.

insecure temporary file

journald in systemd, when the origin of native messages is set to file

CVE-2013-4393 - October 28, 2013

journald in systemd, when the origin of native messages is set to file, allows local users to cause a denial of service (logging service blocking) via a crafted file descriptor.

The SetX11Keyboard function in systemd, when PolicyKit Local Authority (PKLA) is used to change the group permissions on the X Keyboard Extension (XKB) layouts description

CVE-2013-4394 - October 28, 2013

The SetX11Keyboard function in systemd, when PolicyKit Local Authority (PKLA) is used to change the group permissions on the X Keyboard Extension (XKB) layouts description, allows local users in the group to modify the Xorg X11 Server configuration file and possibly gain privileges via vectors involving "special and control characters."

Incorrect Default Permissions

systemd does not properly use D-Bus for communication with a polkit authority, which

CVE-2013-4327 - October 03, 2013

systemd does not properly use D-Bus for communication with a polkit authority, which allows local users to bypass intended access restrictions by leveraging a PolkitUnixProcess PolkitSubject race condition via a (1) setuid process or (2) pkexec process, a related issue to CVE-2013-4288.

Race Condition