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CVE-2021-36159

Description

libfetch before 2021-07-26, as used in apk-tools, xbps, and other products, mishandles numeric strings for the FTP and HTTP protocols. The FTP passive mode implementation allows an out-of-bounds read because strtol is used to parse the relevant numbers into address bytes. It does not check if the line ends prematurely. If it does, the for-loop condition checks for the '\0' terminator one byte too late.

POC

Reference

- https://gitlab.alpinelinux.org/alpine/apk-tools/-/issues/10749

Github

- https://github.com/0xDeCA10B/attackfinder

- https://github.com/ARPSyndicate/cvemon

- https://github.com/Frannc0/test2

- https://github.com/NeXTLinux/griffon

- https://github.com/SilveiraLeonardo/experimenting_mkdown

- https://github.com/VAN-ALLY/Anchore

- https://github.com/anchore/grype

- https://github.com/aymankhder/scanner-for-container

- https://github.com/isgo-golgo13/gokit-gorillakit-enginesvc

- https://github.com/khulnasoft-labs/griffon

- https://github.com/metapull/attackfinder

- https://github.com/mmartins000/sinker

- https://github.com/mvbalamca/image-vulnerability-checker-lib

- https://github.com/n0-traces/cve_monitor

- https://github.com/step-security-bot/griffon

- https://github.com/tamboliv10/GitCode-Vulnerability-Scanner-OSS---Security-

- https://github.com/thecyberbaby/Trivy-by-AquaSecurity

- https://github.com/thecyberbaby/Trivy-by-aquaSecurity

- https://github.com/vissu99/grype-0.70.0