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CVE-2018-25032

Public on 2022-03-25
Modified on 2023-01-18
Description

An out-of-bounds access flaw was found in zlib, which allows memory corruption when deflating (ex: when compressing) if the input has many distant matches. For some rare inputs with a large number of distant matches (crafted payloads), the buffer into which the compressed or deflated data is written can overwrite the distance symbol table which it overlays. This issue results in corrupted output due to invalid distances, which leads to out-of-bound access, corrupting the memory and potentially crashing the application.

Severity
Important
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CVSS v3 Base Score
8.2
See breakdown
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 rsync 2022-12-01 17:33 ALAS-2022-1640
Amazon Linux 2023 rsync 2023-02-17 20:41 ALAS2023-2023-002
Amazon Linux 1 zlib 2022-06-30 23:38 ALAS-2022-1602
Amazon Linux 2 - Core zlib 2022-04-04 23:23 ALAS2-2022-1772
Amazon Linux 2023 zlib 2023-02-17 20:42 ALAS2023-2023-003

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
NVD CVSSv2 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
NVD CVSSv3 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H