Skype Bug Enables Android Lock Screen Bypass

Up to half a billion Android devices that have Skype installed are vulnerable to having their lock screen bypassed and being attack-dialed.

9 Android Tools That Boost Security, Privacy (click image for larger view)
More than 100 million Android devices could have their lock screens bypassed via a bug in the latest version of Skype.
That warning was sounded Monday by Pulser, the developer administrator for XDA-Developers Forum, who said hed tested the attack on the latest version of Skype (3.2.0.6673), which was released Monday, and multiple Android devices, including a Huawei Premia 4G, Samsung Galaxy Note 2 and Sony Xperia Z.
The Skype for Android application appears to have a bug which permits the Android inbuilt lock screen (i.e., pattern, PIN, password) to be bypassed relatively easily, if the device is logged into Skype, and the attacker is able to call the victim on Skype, he said in a
post to the Full Disclosure mailing list
. He reported verifying the attack using two different Skype accounts and two devices, one of which was the target, which had its lock screen active and engaged.
[ Google offers tips for online security. Read
Google Shares Advice On Wi-Fi Security
. ]
According to Google Play, the
Skype app
has been installed on between 100 million and 500 million Android devices.
The attack works by sending a Skype call to the target device, Pulser explained, which will cause it to wake, ring, and display a prompt on the screen to answer or reject the call. After the call is accepted via the green answer button, the attacker must then end the call, which will cause the target device to again display the lock screen. But turning off that lock screen -- by tapping the power button once -- and then turning it back on again will then bypass the lock screen. It will remain bypassed until the device is rebooted, Pulser explained, thus giving a would-be attacker full access to the device.
Reached by email, a press contact for Skype, which is owned by Microsoft, wasnt immediately able to comment on the bug report.
Pulser said the lock screen bypass resembles, ironically, a similar vulnerability -- discovered in April by Vietnamese information security firm Bkav -- which affected an Android app built by
Skype rival Viber
, which is likewise installed on over 100 million Android devices. Using the bug in Vibers Android app, which has since been patched, an attacker could send a Viber message to a target that also had the software installed, which would trigger a pop-up message. By ending the call from the attack phone, the attacker could then press the back button on the targeted device to bypass the lock screen and gain full access.
Smartphones and tablets running Android arent the only devices that have suffered lock-screen-bypass vulnerabilities. Earlier this year, for example, reports surfaced of a
lock screen bypass in iPhone 5
, running iOS 6.1, that could be invoked by dialing and canceling an emergency call, then holding down the power button twice. Security experts reported that the vulnerability resembled a similar bug that was found in iOS 4.1 and patched in iOS 4.2.

Last News
▸ ArcSight prepares for future at user conference post HP acquisition. ◂ Discovered: 07/01/2025 Category: security	▸ Samsung Epic 4G: First To Use Media Hub ◂ Discovered: 07/01/2025 Category: security	▸ Many third-party software fails security tests ◂ Discovered: 07/01/2025 Category: security

**Cyber Security Categories**
Google Dorks Database	Exploits Vulnerability	Exploit Shellcodes

CVE List

Tools/Apps

News/Aarticles

Phishing Database

Deepfake Detection

Trends/Statistics & Live Infos

Tags:
Skype Bug Enables Android Lock Screen Bypass