Vulnerabilities > CVE-2017-2777 - Integer Overflow or Wraparound vulnerability in Iceni Argus 6.6.05
Attack vector
NETWORK Attack complexity
MEDIUM Privileges required
NONE Confidentiality impact
PARTIAL Integrity impact
PARTIAL Availability impact
PARTIAL Summary
An exploitable heap overflow vulnerability exists in the ipStringCreate function of Iceni Argus Version 6.6.05. A specially crafted pdf file can cause an integer overflow resulting in heap overflow. An attacker can send file to trigger this vulnerability.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 1 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Forced Integer Overflow This attack forces an integer variable to go out of range. The integer variable is often used as an offset such as size of memory allocation or similarly. The attacker would typically control the value of such variable and try to get it out of range. For instance the integer in question is incremented past the maximum possible value, it may wrap to become a very small, or negative number, therefore providing a very incorrect value which can lead to unexpected behavior. At worst the attacker can execute arbitrary code.
Seebug
| bulletinFamily | exploit |
| description | ### Summary An exploitable heap overflow vulnerability exists in the ipStringCreate function of Iceni Argus Version 6.6.05. A specially crafted pdf file can cause an integer overflow resulting in heap overflow. An attacker can send file to trigger this vulnerability. ### Tested Versions Iceni Argus 6.6.05 (Sep 22 2016) NK ### Product URLs http://www.iceni.com/legacy.htm ### CVSSv3 Score 8.8 - CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSSv3 Calculator: https://www.first.org/cvss/calculator/3.0 ### CWE CWE-190: Integer Overflow or Wraparound ### Details ``` This vulnerability is present in the Iceni Argus PDF which is used inter alia to convert pdf files to (x)html form. ``` This product is mainly used by MarkLogic for pdf document conversions as part of their web based document search and rendering. A specially crafted PDF file can lead to an heap corruption and ultimately to remote code execution. ``` The problem exists in one of general functions, this is `ipStringCreate`. As its name says, the function is responsible for creating string object from supplied parameters: a buffer and its size. ``` Let's take a look at body of this function: ``` Line 1 _DWORD *__cdecl ipStringCreate(int a1, void *buffPtr, size_t size) Line 2 { Line 3 _DWORD *v3; // esi@2 Line 4 Line 5 if ( a1 ) Line 6 v3 = (_DWORD *)icnChainAlloc(a1, size + 11); Line 7 else Line 8 v3 = icnMalloc(size + 11, (unsigned int)"IPSTRING"); Line 9 if ( v3 ) Line 10 { Line 11 v3[1] = size; Line 12 *(_BYTE *)v3 = 0; Line 13 memmove(v3 + 2, buffPtr, size); Line 14 } Line 15 return v3; Line 16 } ``` In `Line 6` where the buffer for the string object is allocated, an integer overflow can appear in the second argument. For `size`, an argument value bigger than 0xfffffff4 will trigger this occurence. Next in `line 13` we see that the `buffPtr` argument content is copied to the allocated buffer. As we can see the `size` argument will have bigger value than `size`+11 which will lead to heap corruption. ``` An example of a place where the `ipStringCreate` function can receive a huge `size` argument is shown below: Line 1 int __cdecl ipXRefGetStreamObj(int a1, unsigned int a2, size_t *size) Line 2 { Line 3 (...) Line 4 (.text:081602A3) Line 5 buffPtr = icnMalloc(*size, (unsigned int)"ipXRefGetStreamObj"); Line 6 if ( !buffPtr Line 7 || (*size = ipDataFeedRead(v42->pstruct_a1_118, buffPtr, *size), Line 8 ipStreamClose((int)v42), Line 9 (v20 = ipStringCreate(0, buffPtr, *size)) == 0) ) Line 10 { Line 11 this piece of code belongs to the `ipXRefGetStreamObj` function. ``` There is a missing check for a potential error code returned from `ipDataFeedRead` which is requal -1 (0xffffffff). We see in `line 7` that returned value is directly assigned to `size` variable and next this variable is passed as 3th argument to `ipStringCreate`. As mentioned before, for values bigger than 0xfffffff4 integer overflow will occure in `ipStringCreate` leading to heap overflow. ### Crash Information ``` Loading configuration... Parsing macros... Macro synth-bookmarks='true' Macro image-output='true' Macro text-output='true' Macro zones='false' Macro ignore-text='true' Macro remove-overprint='false' Macro illustrations='true' Macro line-breaks='true' Macro image-quality='75' Macro page-start='' Macro page-end='' Macro document-start='' Macro document-end='' features='11140221' Processing... Program received signal SIGSEGV, Segmentation fault. [----------------------------------registers-----------------------------------] EAX: 0xf79f5e28 --> 0x0 EBX: 0xf7f0c000 --> 0x1aada8 ECX: 0xfffb915f EDX: 0x999b000 ESI: 0x9954258 --> 0xf7f0c400 --> 0xf7dd8ca0 (: push ebx) EDI: 0xffffffff EBP: 0xfffc6c3c --> 0xffffffff ESP: 0xfffc6b18 --> 0x8fbc6e8 --> 0x8fbbe90 --> 0x1 EIP: 0xf7e972d9 (movntdq XMMWORD PTR [edx],xmm0) EFLAGS: 0x10286 (carry PARITY adjust zero SIGN trap INTERRUPT direction overflow) [-------------------------------------code-------------------------------------] 0xf7e972ca: lea eax,[eax+0x80] 0xf7e972d0: lfence 0xf7e972d3: sub ecx,0x80 => 0xf7e972d9: movntdq XMMWORD PTR [edx],xmm0 0xf7e972dd: movntdq XMMWORD PTR [edx+0x10],xmm1 0xf7e972e2: movntdq XMMWORD PTR [edx+0x20],xmm2 0xf7e972e7: movntdq XMMWORD PTR [edx+0x30],xmm3 0xf7e972ec: movntdq XMMWORD PTR [edx+0x40],xmm4 [------------------------------------stack-------------------------------------] 0000| 0xfffc6b18 --> 0x8fbc6e8 --> 0x8fbbe90 --> 0x1 0004| 0xfffc6b1c --> 0x81053ef (add esp,0x10) 0008| 0xfffc6b20 --> 0x9954260 --> 0x0 0012| 0xfffc6b24 --> 0xf79af008 --> 0x0 0016| 0xfffc6b28 --> 0xffffffff 0020| 0xfffc6b2c --> 0x8fbc6e8 --> 0x8fbbe90 --> 0x1 0024| 0xfffc6b30 --> 0x8fbc6e8 --> 0x8fbbe90 --> 0x1 0028| 0xfffc6b34 --> 0x33 ('3') [------------------------------------------------------------------------------] Legend: code, data, rodata, value Stopped reason: SIGSEGV __memmove_ssse3_rep () at ../sysdeps/i386/i686/multiarch/memcpy-ssse3-rep.S:1294 1294 ../sysdeps/i386/i686/multiarch/memcpy-ssse3-rep.S: No such file or directory. gdb-peda$ bt #0 __memmove_ssse3_rep () at ../sysdeps/i386/i686/multiarch/memcpy-ssse3-rep.S:1294 #1 0x081053ef in ipStringCreate () #2 0x081602eb in ipXRefGetStreamObj () #3 0x0809d13b in ipObjResolveMem () #4 0x0809d6de in ipObjResolve () #5 0x0808ae89 in ipDocGetNofPages () #6 0x080dd105 in indexPageRefs () #7 0x08090d43 in ipDocCreate () #8 0x0806a3ec in icnDocCreate () #9 0x080556a7 in dumpFile () #10 0x080558e3 in dumpCommandLine () #11 0x08051ef5 in icnArgusExtract () #12 0x08050f76 in main () #13 0xf7d7aaf3 in __libc_start_main (main=0x8050810 , argc=0x2, argv=0xffffd124, init=0x83a20b0 , fini=0x83a20a0 , rtld_fini=0xf7feb160 , stack_end=0xffffd11c) at libc-start.c:287 #14 0x08050779 in _start () gdb-peda$ exploitable -m Warning: machine string printing is deprecated and may be removed in a future release. EXCEPTION_FAULTING_ADDRESS:0x0000000999b000 EXCEPTION_CODE:0xb FAULTING_INSTRUCTION:movntdq XMMWORD PTR [edx],xmm0 MAJOR_HASH:11fb4e93a4aed79572ed69570240cdbc MINOR_HASH:5448472d466da074f83d513d364816da STACK_DEPTH:13 STACK_FRAME:/lib/i386-linux-gnu/libc-2.19.so!__memmove_ssse3_rep+0x0 STACK_FRAME:/home/icewall/bugs/cvtpdf_86/convert!ipStringCreate+0x0 STACK_FRAME:/home/icewall/bugs/cvtpdf_86/convert!ipXRefGetStreamObj+0x0 STACK_FRAME:/home/icewall/bugs/cvtpdf_86/convert!ipObjResolveMem+0x0 STACK_FRAME:/home/icewall/bugs/cvtpdf_86/convert!ipObjResolve+0x0 STACK_FRAME:/home/icewall/bugs/cvtpdf_86/convert!ipDocGetNofPages+0x0 STACK_FRAME:/home/icewall/bugs/cvtpdf_86/convert!indexPageRefs+0x0 STACK_FRAME:/home/icewall/bugs/cvtpdf_86/convert!ipDocCreate+0x0 STACK_FRAME:/home/icewall/bugs/cvtpdf_86/convert!icnDocCreate+0x0 STACK_FRAME:/home/icewall/bugs/cvtpdf_86/convert!dumpFile+0x0 STACK_FRAME:/home/icewall/bugs/cvtpdf_86/convert!dumpCommandLine+0x0 STACK_FRAME:/home/icewall/bugs/cvtpdf_86/convert!icnArgusExtract+0x0 STACK_FRAME:/home/icewall/bugs/cvtpdf_86/convert!main+0x0 INSTRUCTION_ADDRESS:0x000000f7e972d9 INVOKING_STACK_FRAME:1 DESCRIPTION:Access violation on destination operand SHORT_DESCRIPTION:DestAv (9/29) OTHER_RULES:AccessViolation (28/29) CLASSIFICATION:EXPLOITABLE EXPLANATION:The target crashed on an access violation at an address matching the destination operand of the instruction. This likely indicates a write access violation, which means the attacker may control the write address and/or value. Description: Access violation on destination operand Short description: DestAv (9/29) Hash: 11fb4e93a4aed79572ed69570240cdbc.5448472d466da074f83d513d364816da Exploitability Classification: EXPLOITABLE Explanation: The target crashed on an access violation at an address matching the destination operand of the instruction. This likely indicates a write access violation, which means the attacker may control the write address and/or value. Other tags: AccessViolation (28/29) ``` ### Timeline * 2017-01-11 - Vendor Disclosure * 2017-02-27 - Public Release ### CREDIT * Discovered by Marcin Noga of Cisco Talos. |
| id | SSV:96553 |
| last seen | 2017-11-19 |
| modified | 2017-09-20 |
| published | 2017-09-20 |
| reporter | Root |
| title | Iceni Argus ipStringCreate Code Execution Vulnerability(CVE-2017-2777) |
Talos
| id | TALOS-2017-0271 |
| last seen | 2019-05-29 |
| published | 2017-02-27 |
| reporter | Talos Intelligence |
| source | http://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0271 |
| title | Iceni Argus ipStringCreate Code Execution Vulnerability |