Linux systemd bug allows denial of service attacks

Old Linux bugs come back to bite users.

analysis, bug

Security researchers have discovered bugs when parsing long file system paths in Linux-based operating systems that can be used to crash them and for local privilege escalation to the root superuser.

The first affects the systemd software which acts as a system and service manager, running as the first OS process (PID 1).

Security vendor Qualys said a vulnerability was introduced into systemd version 220 in April 2015, which allows an unprivileged user to panic the Linux kernel, and cause a denial of service attack.

Long mount point paths can crash systemd with a segmentation fault which, in turn, takes down the entire operating system.

“As a result, if the total path length of this mountpoint exceeds 8MB (the default RLIMIT_STACK), then systemd crashes with a segmentation fault that also crashes the entire operating system (a kernel panic, because systemd is the 'global init', PID 1),” Qualys said in its technical analysis of the bug.

There are no mitigations for the CVE-2021-33910 systemd bug, and Qualys recommends that administrators apply patches from the Linux distributions immediately.

A related bug, CVE-2021-33909 or “Sequoia”, allows local, non-privileged users to elevate their accounts to the root superuser one, by abusing long folder paths.

The attack requires users to create, mount and delete a deep directory structure with a total path length exceeding 1 gigabyte.

There are mitigations against the Sequoia bug which was introduced into the Linux kernel in 2014, but they do not completely address the vulnerability and Qualys advises users to apply patches as soon as possible.

News Related


What are the technologies the UK could use for a national road pricing system – and would they work?

Road pricing could be introduced to reduce congestion. Shutterstock Within the next two decades the UK is set for a total switch from petrol and diesel cars to electric cars, ... Read more »

Latino senators want more investment in Hispanic-serving colleges, universities

Democratic Sens. Alex Padilla and Bob Menendez link U.S. competitiveness and the economic growth of states like California to improved Latino higher education. Read more »

Luxury Sydney mansion sells for $11.5million after a tour on Facetime

© Provided by Daily Mail MailOnline logo A Sydney mansion has sold for an incredible $11.5million after a mystery buyer inspected the property via Facetime.  Recruiter Jason Johnson and his ... Read more »

Aust to foil China bid to join trade pact

Trade Minister Dan Tehan says Australia will oppose China’s bid to join a key trade pact until it halts trade strikes against Australian exports and ­resumes minister-to-minister contacts with the Morrison ... Read more »

Trbojevic beats Tedesco in battle of No.1s

In the battle of the superstar fullbacks, Tom Trbojevic won. © Dave Hunt/AAP PHOTOS Too valuable to risk, Tom Trbojevic got an early mark with Manly’s win over the Roosters ... Read more »

Early Pfizer deal would have saved up to 150 lives and ended lockdowns earlier

Emails released under freedom of information laws showed Health Minister Greg Hunt didn’t sign a contract with Pfizer for COVID-19 vaccines until months after he was first contacted by the ... Read more »

Historians versus hysterians

Condemned: The Transported Men, Women and Children Who Built Britain’s Empire. Graham Seal. Yale University Press © Provided by Crikey Doom: The Politics of Catastrophe. Niall Ferguson. Penguin Day of the Assassins. ... Read more »

Turbo-powered Manly too good for Roosters

A Tom Trbojevic-inspired Manly have thumped the Sydney Roosters in Mackay to march into their first NRL preliminary final since 2013. © Dave Hunt/AAP PHOTOS Tom Trbojevic (c) was back ... Read more »

The nuclear option: will submarines be a Trojan Horse for reactors?

Scott Morrison tried to be very clear yesterday: Australia’s nuclear submarines would not be a Trojan Horse for a military or civilian nuclear program. That didn’t stop his announcement making ... Read more »

Jasmine Yarbrough attends her grandmother's funeral

© Provided by Daily Mail MailOnline logo Jasmine Yarbrough attended the funeral of her late grandmother on Friday, who passed away at the age of 96. The shoe designer and ... Read more »

Penrith lose weapon To'o for semi-final

Penrith have lost one of their most potent weapons after regaining another for Saturday night’s NRL semi-final against Parramatta as they fight to avoid the worst finals capitulation in 32 ... Read more »

French Ambassador says Australia's decision to scrap submarine deal was a breach of trust

© Provided by ABC NEWS Jean-Pierre Thebault says Australia’s decision is a “breach of confidence”. (ABC News: Matt Roberts) The French Ambassador has accused Australia of deliberately keeping his country in ... Read more »

Brian Houston steps aside from Hillsong's boards as his day in court looms

Pastor Brian Houston, whose name is synonymous with the Hillsong megachurch, has stepped aside from virtually all his directorships in Hillsong entities in a major corporate overhaul before he is ... Read more »

Queensland nurses stranded in NSW

Two Queensland nurses who travelled to New South Wales to assist frontline health workers amid staff shortages due to the COVID-19 crisis say they’ve been abandoned and are unable to ... Read more »

‘Plea for help': Sydney residents rally around fugitive turned homeless handyman

Darko “Dougie” Desic was on the run for three decades after escaping from Grafton correctional centre in New South Wales in 1992. © Provided by The Guardian Photograph: Joel Carrett/AAP ... Read more »

Truckie rams border-checkpoint in Queensland

© Provided by Daily Mail MailOnline logo An interstate truck driver has been arrested by Queensland Police after ramming through a border-checkpoint 300km west of Brisbane. A 26-year-old man was ... Read more »

Experts say China trade sanctions over AUKUS deal unlikely, but flag long-term concerns

© ASSOCIATED PRESS Experts say China trade sanctions over AUKUS deal unlikely, but flag long-term concerns (Mass Communication Specialist 1st Class Michael B. Zingaro/U.S. Navy via AP) China’s scathing reaction ... Read more »

Sunshine Coast private school teacher arrested for allegedly possessing child exploitation material

Police have charged a Sunshine Coast private school teacher with possessing child exploitation material after spending nine months combing through his electronic devices. Police arrested the man from Glenview, north of ... Read more »

Kristina Keneally's relentless ambition could cost Labor dearly

© 2021 Getty Images Senator Kristina Keneally (Photo by Sam Mooy/Getty Images) Here is a story about Kristina Keneally. In mid-2020, when the preoccupying issue was how Carnival’s Ruby Princess ... Read more »

When Jodi Willard tested positive for COVID she isolated at home for 14 days, now she can't get the paperwork she needs to leave

© Provided by ABC News Jodi Willard is hoping to hear from someone so she can return to work. (Supplied: Jodi Willard) When Jodi Willard tested positive for COVID-19 she isolated ... Read more »

Barty in doubt for Indian Wells and WTA Finals in Mexico

© ASSOCIATED PRESS Ashleigh Barty (AP Photo/Frank Franklin II) Ashleigh Barty is undecided about playing in next month’s prestigious Indian Wells tournament in California, on top of doubts about her ... Read more »

Truckie rams Qld-NSW border check point

An interstate truck driver has been arrested by Queensland Police after ramming through a border-checkpoint 300km west of Brisbane. © PR HANDOUT IMAGE PHOTO A NSW truck driver allegedly rammed ... Read more »

Iron ore miners friendless, ASX lower

Iron ore miners have plunged and caused the steepest drop of the week for the Australian share market. © Joel Carrett/AAP PHOTOS Heavy falls for iron ore miners dragged the ... Read more »

Queenslanders to get COVID vaccine choice

Queenslanders have been promised a new era of choice when it comes to COVID-19 vaccines as a long-awaited surge in supplies begins. © Tara Croser/AAP PHOTOS Queenslanders are being asked ... Read more »

Taking the nuclear option

© Provided by Crikey AUKUS PACT MENTALITY China has slammed our new security pact with the UK and US, saying it could severely damage regional peace and intensify the arms ... Read more »

Nuclear-powered submarines have 'long history of accidents', Adelaide environmentalist warns

© Provided by ABC NEWS A new fleet of nuclear-powered submarines will eventually replace the Collins class. (Defence Department) The plan to build nuclear-powered submarines in South Australia has alarmed anti-war ... Read more »

Boks' No.1 spot on line against Wallabies

Wallabies captain Michael Hooper expects more of the same, only better from South Africa as their world No.1 status goes on the line in Brisbane. © Regi Varghese/AAP PHOTOS The ... Read more »

Alleged IS member bailed to house arrest

A university student accused of pledging allegiance to Islamic State has been released on bail after agreeing to undergo deradicalisation treatment and remain under house arrest. © Bianca De Marchi/AAP ... Read more »

Qld teacher faces exploitation charges

A private school teacher from the Sunshine Coast has been charged with possessing and sharing child exploitation material. © Dave Hunt/AAP PHOTOS A 41-year-old Qld teacher has been charged with possessing ... Read more »

Rapid tests to help NSW jury trials return

Routine rapid antigen testing will be introduced into the nation’s largest criminal court in order to return jury trials to Sydney. © Mick Tsikas/AAP PHOTOS About 200 trials have been ... Read more »

Truckie rams into Qld-NSW border

An interstate truck driver has been arrested by Queensland Police after ramming through a border-checkpoint at an inland town 300km west of Brisbane. © Darren England/AAP PHOTOS A NSW truck ... Read more »

Keeper Jones takes long road back to Perth

Former Liverpool goalkeeper Brad Jones says the likely delayed start to the A-League season is just what he needs after enduring a hectic journey to get to Perth. © David ... Read more »

Restrictions in Sydney's west 'sadistic'

People in west and southwest Sydney have been traumatised and made to feel like criminals in their own homes, an inquiry into the state government’s handling of the pandemic has ... Read more »

Two people killed in Melbourne car crash

Two people have died in a car crash south-east of Melbourne this afternoon. Emergency services were called to the accident in Devon Meadows about 1.30pm. Police believe a car was ... Read more »

Man allegedly stabbed to death after confronting mother with knife

A man who is believed to have knocked on the door of a Melbourne home to confront a mother has died after being allegedly stabbed. Police said a 45-year-old man ... Read more »

Australia is almost 70% vaccinated. Here are 9 vaccine questions a doctor is still being asked.

I’m Dr Preeya Alexander, and I’m a Melbourne GP working on the frontline as case numbers increase. © Getty Images Australia is almost 70% vaccinated. Here are 9 vaccine questions ... Read more »

StarTrack truck drivers to strike for 24 hours next week, as Australia Post struggles with record volume of parcels

© Provided by ABC Business The Transport Workers Union’s national secretary, Michael Kaine, says the “Amazon Effect” is driving standards down across major transport operators in Australia (ABC News: John Gunn) ... Read more »

Carl Allan Bridge sentenced to nine years' jail over Corrigin double fatality truck crash

© Provided by ABC NEWS Jason Bropho and Amy’s mother Shirley Bropho-Dawson say they are ‘heartbroken’ over their loss. (ABC News: Akash Fotedar) A drug-affected truck driver who ploughed into ... Read more »

Authorities plead with Queenslanders to get vaccinated this weekend

© Provided by Daily Mail MailOnline logo Authorities have pleaded with Queenslanders to make the most of a state-wide vaccination blitz this weekend, with 38 community hubs open for walk-in ... Read more »

Adelaide paedophile Geoffrey William Moyle sentenced over abuse of Cambodian children

An Adelaide man who admitted to filming himself sexually abusing children in Cambodia before publishing the videos online has been sentenced to eight years in prison. Geoffrey William Moyle, 48, pleaded ... Read more »