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Change History

When verifying a mac with a ChunkedMacVerification object, Tink compares the resulting tag with non constant time comparison. This potentially allows an attacker to use timinig information as a side channel in order to get information how many bytes of a given tag match the correct tag. This in turn could allow to find a correct tag bytewise.

AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CWE-208

https://github.com/tink-crypto/tink-java/issues/75

[{"vendor":"Google","product":"Tink-Java","defaultStatus":"unaffected","versions":[{"version":"All releases before 1.21.0, including 1.21.0.","status":"affected"}]},{"vendor":"Google","product":"Tink-Android","defaultStatus":"unaffected","versions":[{"version":"All releases before 1.21.0, including 1.21.0.","status":"affected"}]}]