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hackeroneNyymiH1:1614330
HistoryJun 27, 2022 - 7:03 a.m.

Internet Bug Bounty: CVE-2022-32206: HTTP compression denial of service

2022-06-2707:03:40
nyymi
hackerone.com
$2400
63
cve-2022-32206
chained http compression
decompression chain
malloc bomb
denial of service
bugbounty

EPSS

0.002

Percentile

59.1%

curl supports “chained” HTTP compression algorithms, meaning that a server response can be compressed multiple times and potentially with different algorithms. The number of acceptable “links” in this “decompression chain” was unbounded, allowing a malicious server to insert a virtually unlimited number of compression steps.

The use of such a decompression chain could result in a “malloc bomb”, making curl end up spending enormous amounts of allocated heap memory, or trying to and returning out of memory errors.

Impact

Denial of service