Alligra Calligra – Heap Buffer Overflow
source: https://www.securityfocus.com/bid/54816/info Calligra is prone to a remote buffer-overflow vulnerability. An attacker can exploit this issue to execute arbitrary code in the context of the user running the affected application. Failed exploit attempts will likely result in denial-of-service conditions. Calligra 2.4.3 and KOffice 2.3.3 are vulnerable; other versions may also be affected. bool STD::read( U16 baseSize, U16 totalSize, OLEStreamReader* stream, bool preservePos ) ... grupxLen = totalSize - ( stream->tell() - startOffset ); grupx = new U8[ grupxLen ]; int offset = 0; for ( U8 i = 0; i < cupx; ++i) { U16 cbUPX = stream->readU16(); // size of the next UPX stream->seek( -2, G_SEEK_CUR ); // rewind the "lookahead" cbUPX += 2; // ...and correct the size for ( U16 j = 0; j < cbUPX; ++j ) { grupx[ offset + j ] = stream->readU8(); // read the whole UPX } |