CVE-2013-4787

Severity: critical (CVSS 9.3 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 13.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2013-07-09 · updated 2026-06-16
Weakness: CWE-310

Description

Android 1.6 Donut through 4.2 Jelly Bean does not properly check cryptographic signatures for applications, which allows attackers to execute arbitrary code via an application package file (APK) that is modified in a way that does not violate the cryptographic signature, probably involving multiple entries in a Zip file with the same name in which one entry is validated but the other entry is installed, aka Android security bug 8219321 and the "Master Key" vulnerability.

Affected products

Android: 1.6, 2.0, 2.0.1, 2.1, 2.2, 2.2-rev1 (+27)

References

http://bluebox.com/corporate-blog/bluebox-uncovers-android-master-key/
http://review.cyanogenmod.org/#/c/45251/
http://www.osvdb.org/94773
http://www.securityfocus.com/bid/60952
http://www.zdnet.com/google-releases-fix-to-oems-for-blue-security-android-security-hole-7000017782/
https://jira.cyanogenmod.org/browse/CYAN-1602
https://plus.google.com/113331808607528811927/posts/GxDA6111vYy
http://bluebox.com/corporate-blog/bluebox-uncovers-android-master-key/
http://review.cyanogenmod.org/#/c/45251/
http://www.osvdb.org/94773
http://www.securityfocus.com/bid/60952
http://www.zdnet.com/google-releases-fix-to-oems-for-blue-security-android-security-hole-7000017782/

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