SERVER-WEBAPP -- Snort has detected traffic exploiting vulnerabilities in web based applications on servers.
SERVER-WEBAPP Apache httpd ap_find_token buffer overread attempt
Multiple web servers contain buffer overflow vulnerabilities due to improper Connection header parsing.
Rule checks for attempts to trigger buffer overflow vulnerabilities in multiple web-servers via a maliciously crafted Connection header value.
Ease of Attack:
What To Look For
This rule will alert when an attempt to exploit a known memory corruption vulnerability in Apache is detected.
No public information
No known false positives
Talos research team.
This document was generated from data supplied by the national vulnerability database, a product of the national institute of standards and technology.
For more information see [nvd].
MITRE ATT&CK Framework
Technique: User Execution
For reference, see the MITRE ATT&CK vulnerability types here:
Buffer Overflows occur when a memory location is filled past its expected boundaries. Computer attackers target systems without proper terminating conditions on buffers, which then write the additional information in other locations in memory, overwriting what is there. This could corrupt the data, making the system behave erratically or crash. The new information could include malicious executable code, which might be executed.
CVE Additional Information
CVE-2017-7668The HTTP strict parsing changes added in Apache httpd 2.2.32 and 2.4.24 introduced a bug in token list parsing, which allows ap_find_token() to search past the end of its input string. By maliciously crafting a sequence of request headers, an attacker may be able to cause a segmentation fault, or to force ap_find_token() to return an incorrect value.
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