Bug 2321470 (CVE-2024-50383)

Summary: CVE-2024-50383 botan: compiler-induced side channel in lib/utils/donna128.h
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Bug Depends On: 2321555, 2321556, 2321557    
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Description OSIDB Bzimport 2024-10-24 10:25:46 UTC
Botan before 3.6.0, when certain GCC versions are used, has a compiler-induced secret-dependent operation in lib/utils/donna128.h in donna128 (used in Chacha-Poly1305 and x25519). An addition can be skipped if a carry is not set. This was observed for GCC 11.3.0 with -O2 on MIPS, and GCC on x86-i386. (Only 32-bit processors can be affected.)