From 431e66398552effd82d5c0ea982a521821782ebd Mon Sep 17 00:00:00 2001 From: Hans Wennborg Date: Fri, 18 Aug 2023 11:05:33 +0200 Subject: [PATCH] minizip: Check length of comment, filename, and extra field, in zipOpenNewFileInZip4_64 These are stored in 16-bit fields in the zip file format. Passing longer values would generate an invalid file. Passing very long values could also cause the computation of zi->ci.size_centralheader to overflow, which would cause heap buffer overflow on subsequent writes to zi->ci.central_header. --- contrib/minizip/zip.c | 11 +++++++++++ 1 file changed, 11 insertions(+) Index: zlib-1.3.1/contrib/minizip/zip.c =================================================================== --- zlib-1.3.1.orig/contrib/minizip/zip.c +++ zlib-1.3.1/contrib/minizip/zip.c @@ -1054,6 +1054,17 @@ extern int ZEXPORT zipOpenNewFileInZip4_ if ((size_extrafield_local>0xffff) || (size_extrafield_global>0xffff)) return ZIP_PARAMERROR; + // The filename and comment length must fit in 16 bits. + if ((filename!=NULL) && (strlen(filename)>0xffff)) + return ZIP_PARAMERROR; + if ((comment!=NULL) && (strlen(comment)>0xffff)) + return ZIP_PARAMERROR; + // The extra field length must fit in 16 bits. If the member also requires + // a Zip64 extra block, that will also need to fit within that 16-bit + // length, but that will be checked for later. + if ((size_extrafield_local>0xffff) || (size_extrafield_global>0xffff)) + return ZIP_PARAMERROR; + zi = (zip64_internal*)file; if (zi->in_opened_file_inzip == 1)