CAPEC-42
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Mô tả CAPEC
Thông tin CAPEC
Luồng thực thi
[Identify target mail server] The adversary identifies a target mail server that they wish to attack.
- Use Nmap on a system to identify a mail server service.
[Determine viability of attack] Determine whether the mail server is unpatched and is potentially vulnerable to one of the known MIME conversion buffer overflows (e.g. Sendmail 8.8.3 and 8.8.4).
[Find injection vector] Identify places in the system where vulnerable MIME conversion routines may be used.
[Craft overflow content] The adversary crafts e-mail messages with special headers that will cause a buffer overflow for the vulnerable MIME conversion routine. The intent of this attack is to leverage the overflow for execution of arbitrary code and gain access to the mail server machine, so the adversary will craft an email that not only overflows the targeted buffer but does so in such a way that the overwritten return address is replaced with one of the adversary's choosing.
- Create malicious shellcode that will execute when the program execution is returned to it.
- Use a NOP-sled in the overflow content to more easily "slide" into the malicious code. This is done so that the exact return address need not be correct, only in the range of all of the NOPs
[Overflow the buffer] Send e-mail messages to the target system with specially crafted headers that trigger the buffer overflow and execute the shell code.
Điều kiện tiên quyết
The target system uses a mail server.Mail server vendor has not released a patch for the MIME conversion routine, the patch itself has a security hole or does not fix the original problem, or the patch has not been applied to the user's system.
Kỹ năng cần thiết
It may be trivial to cause a DoS via this attack patternCausing arbitrary code to execute on the target system.
Các biện pháp giảm thiểu
Stay up to date with third party vendor patchesUse the sendmail restricted shell program (smrsh)
Use mail.local
Điểm yếu liên quan
| Tên điểm yếu | |
|---|---|
CWE-120 |
Buffer Copy without Checking Size of Input The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. |
CWE-119 |
Improper Restriction of Operations within the Bounds of a Memory Buffer The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. |
CWE-74 |
Improper Neutralization of Special Elements in Output Used by a Downstream Component The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. |
CWE-20 |
Improper Input Validation The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. |
Tài liệu tham khảo
REF-1
Exploiting Software: How to Break CodeG. Hoglund, G. McGraw.
REF-364
CERT Advisory CA-1997-05 MIME Conversion Buffer Overflow in Sendmail Versions 8.8.3 and 8.8.4http://www.cert.org/advisories/CA-1997-05.html
Gửi
| Tên | Tổ chức | Ngày | Ngày phát hành |
|---|---|---|---|
| CAPEC Content Team | The MITRE Corporation |
Sửa đổi
| Tên | Tổ chức | Ngày | Bình luận |
|---|---|---|---|
| CAPEC Content Team | The MITRE Corporation | Updated Execution_Flow | |
| CAPEC Content Team | The MITRE Corporation | Updated Example_Instances, Mitigations |
