7.5

CVSS Score

3.0

-

CVSS Score

Basic Information

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CVE-2017-11164

CVE-2017-11164: In PCRE 8.41, the OP_KETRMAX feature in the match function in pcre_exec.c allows stack exhaustion...

In PCRE 8.41, the OP_KETRMAX feature in the match function in pcre_exec.c allows stack exhaustion (uncontrolled recursion) when processing a crafted regular expression.

(GitHub Advisory)

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CVE-2017-11164

CVE-2017-11164:

7.5

CVSS Score

3.0

-

CVSS Score

Basic Information

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Technical Details

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Root Cause Analysis

The vulnerability description and supporting documents (NVD, oss-security mailing list) directly name the 'match' function in 'pcre_exec.c' as the location of the uncontrolled recursion. The oss-security post further details that a recursive call, RMATCH, within this function is the mechanism for the stack exhaustion. Since no patch information was provided, this analysis relies on the textual descriptions of the vulnerability. The confidence is high because multiple sources pinpoint the same function and file. The RMATCH macro is a strong indicator of the recursive nature within the match function itself or a closely related internal function called by match that also uses RMATCH for recursion. For a profiler, the match function would be the entry point and the one repeatedly appearing in the stack trace during exploitation due to the recursion. The exact line RMATCH(eptr, prev, offset_top, md, eptrb, RM13); is the specific code construct leading to the vulnerability within the match function's logic for OP_KETRMAX handling (or a sub-call made by it).

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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