9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2022-37434

CVE-2022-37434: zlib through 1.2.12 has a heap-based buffer over-read or buffer overflow in inflate in inflate.c...

zlib through 1.2.12 has a heap-based buffer over-read or buffer overflow in inflate in inflate.c via a large gzip header extra field. NOTE: only applications that call inflateGetHeader are affected. Some common applications bundle the affected zlib source code but may be unable to call inflateGetHeader (e.g., see the nodejs/node reference).

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2022-37434

CVE-2022-37434:

9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

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Root Cause Analysis

The analysis is based on the provided commit eff308af425b67093bab25f80f1ae950166bece1 which explicitly fixes a buffer overflow in the inflate function in inflate.c. The commit message clearly states that the bug occurs when getting a gzip header extra field with inflate(), and if the extra field is larger than the user-provided space (via inflateGetHeader()) and delivered over multiple calls, a buffer overflow could happen. The code changes in the patch are within the inflate function, specifically around a zmemcpy operation that copies data into state->head->extra. The fix involves adding checks and adjusting logic to ensure that the copy operation does not exceed state->head->extra_max. The vulnerability description also directly names inflate in inflate.c as the location of the overflow and inflateGetHeader as a precondition. The second commit 1eb7682f845ac9e9bf9ae35bbfb3bad5dacbd91d is a fix for a null dereference introduced by the first fix, further confirming that the core logic being modified is within inflate.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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