Feeds

LinkedIn cookie vulnerable, claims researcher

The user is gone but the session lingers on

Intelligent flash storage arrays

Fresh from an IPO in which its bankers sent millions to pre-float insiders by low-balling its price, LinkedIn has been accused of slack security by Indian security Rishi Narang.

Narang, who published his analysis of LinkedIn cookie handling here, identified two cookie handling problems: an SSL cookie is used without having its “secure” flag set, and cookies are available after the end of authenticated sessions.

In the first case, all cookies, including JSESSIONID and LEO_AUTH_TOKEN, are held in plain text. Since “these cookies appear to contain session information”, these cookies could be captured over an established LinkedIn session.

Session expiration is, perhaps, a more serious problem. Since the cookies remain on a machine after a session is ended, a malicious user could use someone else’s cookies to re-establish a connection to their account (an obvious example being accessing a workmate’s computer).

When Narang identified this flaw, the cookies were set to persist for a year rather than being deleted at the termination of a session. “As a result, in just 15 minutes, I was successfully able to access multiple active accounts that belong to individuals from different global locations,” he wrote.

Narang says that the cookie can only be forced to expire if a user changes the LinkedIn password, logs out, and logs in with the new password.

LinkedIn has responded that it is addressing the cookie lifetime, which it will reduce to 90 days, and recommends using encrypted WiFi networks or VPNs for access. Its response, in full and unedited, goes like this:

“Whether you are on LinkedIn or any other site, it's always a good idea to choose trusted and encrypted wifi networks or VPNs whenever possible.

“If one isn't available, we already support SSL for logins and other sensitive web pages. Now, we are accelerating our existing plans to extend that SSL support across the entire site on an opt-in basis. And, we are going to reduce the lifespan of the cookies in question from 12 months to 90 days.

“LinkedIn takes the privacy and security of our members seriously, while also looking to deliver a great site experience, and we believe these two changes will allow us to strike that balance.” ®

Top 5 reasons to deploy VMware with Tegile

More from The Register

next story
Regin: The super-spyware the security industry has been silent about
NSA fingered as likely source of complex malware family
Why did it take antivirus giants YEARS to drill into super-scary Regin? Symantec responds...
FYI this isn't just going to target Windows, Linux and OS X fans
Privacy bods offer GOV SPY VICTIMS a FREE SPYWARE SNIFFER
Looks for gov malware that evades most antivirus
Home Office: Fancy flogging us some SECRET SPY GEAR?
If you do, tell NOBODY what it's for or how it works
HACKERS can DELETE SURVEILLANCE DVRS remotely – report
Hikvision devices wide open to hacking, claim securobods
'Regin': The 'New Stuxnet' spook-grade SOFTWARE WEAPON described
'A degree of technical competence rarely seen'
Syrian Electronic Army in news site 'hack' POP-UP MAYHEM
Gigya redirect exploit blamed for pop-rageous ploy
Astro-boffins start opening universe simulation data
Got a supercomputer? Want to simulate a universe? Here you go
prev story

Whitepapers

Driving business with continuous operational intelligence
Introducing an innovative approach offered by ExtraHop for producing continuous operational intelligence.
A strategic approach to identity relationship management
ForgeRock commissioned Forrester to evaluate companies’ IAM practices and requirements when it comes to customer-facing scenarios versus employee-facing ones.
How to determine if cloud backup is right for your servers
Two key factors, technical feasibility and TCO economics, that backup and IT operations managers should consider when assessing cloud backup.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Internet Security Threat Report 2014
An overview and analysis of the year in global threat activity: identify, analyze, and provide commentary on emerging trends in the dynamic threat landscape.