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

Whitepapers

Choosing cloud Backup services
Demystify how you can address your data protection needs in your small- to medium-sized business and select the best online backup service to meet your needs.
Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.