GIMP 2.8.0 – ‘.FIT’ File Format Denial of Service

• Exploit Database
• 11 阅读

• 作者： Joseph Sheridan
  日期： 2012-06-30
• 类别：

  • dos
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/19482/

• Summary
  =======
  
  There is a file handling DoS in GIMP (the GNU Image Manipulation Program) for
  the 'fit' file format affecting all versions (Windows and Linux) up to and 
  including 2.8.0. A file in the fit format with a malformed 'XTENSION' header 
  will cause a crash in the GIMP program.
  
  CVE number: CVE-2012-3236
  Vendor Homepage: http://www.gimp.org/
  Date reported to vendor: 25/05/2012
  Found by Joseph Sheridan:
  href="http://www.reactionpenetrationtesting.co.uk/joseph-sheridan.html
  
  This advisory is posted at:
  http://www.reactionpenetrationtesting.co.uk/FIT-file-handling-DoS.html
  
  PoC file is available here:
  http://www.reactionpenetrationtesting.co.uk/vuln.fit
  https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/19482.fit
  
  
  Affected Products
  =================
  
  Vulnerable Products
  +------------------
  
  The following products are known to be affected by this vulnerability:
  
  * GIMP <= 2.8.0 (Windows or Linux builds)
  
  Products Not Vulnerable
  +--------------------------------
  * GIMP 2.8.1
  
  Details
  =======
  
  There is a file handling DoS in GIMP (the GNU Image Manipulation Program) for
  the 'fit' file format affecting all versions (Windows and Linux) up to 2.8.0. 
  A file in the fit format with a malformed 'XTENSION' header will cause a crash 
  in the GIMP program. The flaw is triggered by opening a crafted 'fit' file or 
  allowing the file explorer dialog to preview the file.
  
  A file in the fit format starting as follows will trigger the crash:
  XTENSIONaaaaaaaaaaaaaaaaaaaaaa...aaaaaaaaaaaaaaaaaaaaaaaaHEADER2...
  
  The vulnerable code is in the fits-io.c lines where the program attempts to 
  copy from a null pointer:
  
  {
  fdat = fits_decode_card (fits_search_card (hdr, "XTENSION"), typ_fstring);
  strcpy (hdulist->xtension, fdat->fstring);
  }
  
  This code can be patched by changing it to the following (as GIMP 2.8.1):
  
  fdat = fits_decode_card (fits_search_card (hdr, "XTENSION"), typ_fstring);
  if(fdat != NULL) {
  strcpy (hdulist->xtension, fdat->fstring);
  } else {
  strcpy (errmsg, "No valid XTENSION header found.");
  goto err_return;
  }
  
  Impact
  ======
  
  Successful exploitation of the vulnerability may result in an application 
  crash and denial of service.
  
  Solution
  ===========
  The GIMP team have provided an update for this issue (release 2.8.1).
  
  Workarounds
  ===========
  
  The fits-io.c file can be patched as above.
  
  Distribution
  ============
  
  In addition to posting on the website, a text version of this notice
  is posted to the following e-mail and Usenet news recipients.
  
  * bugtraq () securityfocus com
  * full-disclosure () lists grok org uk
  * oss [dash] security [dash] subscribe [at] lists [dot] openwall [dot] com
  
  Future updates of this advisory, if any, will be placed on the ReactionIS
  corporate website, but may or may not be actively announced on
  mailing lists or newsgroups. Users concerned about this problem are
  encouraged to check the URL below for any updates:
  
  http://www.reactionpenetrationtesting.co.uk/FIT-file-handling-DoS.html
  
  ========================================================================
  ====
  
  Reaction Information Security 
  Lombard House Business Centre,
  Suite 117,
  12-17 Upper Bridge Street,
  Canterbury, Kent, CT1 2NF
  
  Phone: +44 (0)1227 785050
  Email: research () reactionis {dot} co {dot} uk
  Web: http://www.reactionpenetrationtesting.co.uk
  
  Joseph Sheridan
  Technical Director
  Principal Consultant
  CHECK Team Leader, CREST Infrastructure, CREST Application, CISSP
  Tel: 07812052515
  Web: www.reactionis.com
  Email: joe (at) reactionis.co (dot) uk [email concealed]
  
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