An issue was discovered in OpenWrt 18.06.0 to 18.06.6 and 19.07.0, and LEDE 17.01.0 to 17.01.7. A bug in the fork of the opkg package manager before 2020-01-25 prevents correct parsing of embedded checksums in the signed repository index, allowing a man-in-the-middle attacker to inject arbitrary package payloads (which are installed without verification).

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-7982
• https://arstechnica.com/information-technology/2020/03/openwrt-is-vulnerable-to-attacks-that-execute-malicious-code/
• https://blog.forallsecure.com/uncovering-openwrt-remote-code-execution-cve-2020-7982
• https://github.com/openwrt/openwrt/commits/master
• https://openwrt.org/advisory/2020-01-31-1