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   err0r2
   http://javaphile.org
   허접한 감회 - VI

http://www.hackerschool.org/HS_Boards/zboard.php?id=Free_Lectures&no=1199 [복사]


오늘은 그냥 늬~우~스 하나만 그냥 퍼오기로 했다.

출처:

  http://www.shadowserver.org/wiki/pmwiki.php?n=Calendar.20090219


When PDFs Attack - Acrobat [Reader] 0-Day On the Loose

The Shadowserver Foundation has recently become aware of a very severe vulnerability in Adobe Acrobat affecting versions 8.x and 9 that is currently on the loose in the wild and being actively exploited. We are aware of several different variations of this attack, however, we were provided with a sample last week in which we were permitted to analyze and detail in this post. We want to make it clear that we did not discover this vulnerability and are only posting this information to make sure others are aware and can adequately protect themselves. All of our testing was done on Adobe Acrobat Reader 8.1.0, 8.1.1, 8.1.2, 8.1.3 (latest release of 8), and 9.0.0 (latest release of 9). We have not confirmed via testing that the exploit actually works on Adobe Acrobat (non-Reader) but believe that it will also affect it as well.

Right now we believe these files are only being used in a smaller set of targeted attacks. However, these types of attacks are frequently the most damaging and it is only a matter of time before this exploit ends up in every exploit pack on the Internet. As a result we are also not going to provide any specific details on how the exploit works despite the fact that information is known. We know several of the details on the internals thanks to a good friend of mine -- Matt Richard. He took a look at the file for us last week and provided the following:

The malicious PDF's in the wild exploit a vulnerability in a non-JavaScript function call. However, they do use some JavaScript to implement a heap spray for successful code execution. The malicious PDF's in the wild contain JavaScript that is used to fill the heap with shellcode. Since this exploit relies on both JavaScript and non-JavaScript components there are some potential reliability issues which has led to confusion over which platforms are affected.

Testing of the exploit with XP SP3 using Adobe Reader 8.1.1, 8.1.2, 8.1.3 and 9.0.0 shows that the vulnerability results in code execution on all of them. There may be cases where Adobe Reader crashes without code execution, especially on systems with more physical memory and faster processors. This is likely due to the race condition needed to populate the heap before certain data structures are parsed by Reader.

The exploit can be effectively mitigated by disabling JavaScript. In this scenario Adobe will still crash but the required heap spray will not occur and code execution is not possible. There may be a method for populating the heap with the necessary shellcode without JavaScript, however if such a technique exists I am not aware of it. As a general rule I like the idea of both disabling JavaScript in Adobe Reader and also flagging PDF documents containing JavaScript at perimeter devices.

In Matt and I's testing, we found that disabling JavaScript would definitely prevent the malware from being installed on the system. However, it would still result in the crash of the application. We would HIGHLY recommend that you DISABLE JAVASCRIPT in your Adobe Acrobat [Reader] products. You have the choice of small loss in functionality and a crash versus your systems being compromised and all your data being stolen. It should be an easy choice.

Disabling JavaScript is easy. This is how it can be done in Acrobat Reader:

Click: Edit -> Preferences -> JavaScript and uncheck Enable Acrobat JavaScript

We believe Adobe is aware of this issue and actively working to address it. However, we felt it was necessary to release this information to let people know how to mitigate against the attacks as they can be devastating. Right now multiple Antivirus companies detect this threat. We will update this post as we have more information that we can share on this.

A special thanks to the kind source that provided the file to us last week for analysis.

---

It has been pointed out to us that Symantec may have been protecting against this since February 12, 2009. We have not had it confirmed but believe they detect it as Trojan.Pidief.E which has a write-up here.
We have also been informed Trend Micro currently detects this threat as "TROJ_PIDIEF.IN".

=>Posted February 19, 2009, at 03:03 PM by Steven Adair

뭐 그저 그렇다는것...시만택曰 :Bloodhound.PDF.6

http://www.symantec.com/en/th/enterprise/security_response/writeup.jsp?docid=2009-021215-2608-99

필요하시면 연락하시길...

  Hit : 13673     Date : 2009/02/20 02:16



    
1481   허접 팁 Setuid 쉽게 찾기 -_-;[3]     ttongfly
09/10 14804
1480   인터넷에 리눅스 서버 구축하기[1]     소유
07/07 14655
1479   - 해커의 수준및 기법[322]     twinz
08/27 14610
1478   * 엘리트해커가 되는길 *추천 *[30]     HackerMapia
03/02 14571
1477   [[초급/강좌]] 유닉스 주요 명령어[7]     소유
10/09 14454
1476   리눅스 명령어 마스터 8 [마지막][44]     소유
09/10 14406
1475   레벨5 레이스컨디션에 대해서. [의외로 질문하시는 분들이 많아서..][9]     yl
10/01 14377
1474   [[초급/강좌]] 유닉스 기본 정리[8]     소유
10/09 14356
1473   BOF 해결 무작정 따라하기 #1[7]     ssuckies
04/12 14341
1472   [자작]리눅스 압축 명령 정리.[2]     williamlee
12/29 14320
1471   리눅스 명령어 마스터 6[7]     소유
09/08 14255
1470   리눅스 명령어 마스터 7[8]     소유
09/09 14148
1469   처음으로 울집 바이러스 분석[9]     dkdkfjgh
12/22 14088
1468   오라클 Enterprise Edition Release 8.0[6]     netwow1
12/14 14023
1467   해커스쿨 Level1 풀이     xodnr631
08/20 13910
1466   리눅스 방화벽의 종류...[4]     bsjzzz
01/12 13880
1465   [프로젝트]상.절.지 해킹사전//해킹공부사이트 URL리스트[5]     W.H.
10/30 13863
1464   넷센드 하는법(하도많이 물어보시길래;;)[13]     qkreoghks00
01/23 13842
1463   Webhacking.kr 51번 RPG게임 나오기[4]     푸른하늘
03/31 13799
1462   ↓보충. 올바른 검색 조건으로, find명령어를 사용하자.[13]     yl
09/09 13725
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