Unspecified vulnerability in libpng before 1.6.20, as used in Android 4.x
before 4.4.4, 5.0.x before 5.0.2, 5.1.x before 5.1.1, and 6.x before
2016-07-01, allows attackers to gain privileges via a crafted application,
as demonstrated by obtaining Signature or SignatureOrSystem access, aka
internal bug 23265085.