5.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2019-20633

CVE-2019-20633: GNU patch through 2.7.6 contains a free(p_line[p_end]) Double Free vulnerability in the function...

GNU patch through 2.7.6 contains a free(p_line[p_end]) Double Free vulnerability in the function another_hunk in pch.c that can cause a denial of service via a crafted patch file. NOTE: this issue exists because of an incomplete fix for CVE-2018-6952.

(GitHub Advisory)

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CVE-2019-20633

CVE-2019-20633:

5.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

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Root Cause Analysis

The vulnerability description and the linked GNU bug report (#56683) explicitly state that the double free vulnerability occurs in the function another_hunk located in the file pch.c (specifically src/pch.c in the patch context). The ASAN trace provided in the bug report confirms this: #1 0x414188 in another_hunk ../../src/pch.c:1187. The patch provided in the bug report modifies this exact function to fix the double free by setting the freed pointer p_line[p_end] to NULL and its length p_len[p_end] to 0 immediately after the free() call. This prevents the same memory from being freed again. The evidence is directly taken from the analysis of the code structure before the patch (where free(p_line[p_end]) could be called without nullifying the pointer) and the nature of the fix applied.

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WAF Rule

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Reasoning

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