CVEs-PoC/2021/CVE-2021-36159.md

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/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/step-security-bot/griffon
• https://github.com/thecyberbaby/Trivy-by-AquaSecurity
• https://github.com/thecyberbaby/Trivy-by-aquaSecurity
• https://github.com/vissu99/grype-0.70.0