process_http_response in OpenConnect before 8.05 has a Buffer Overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes.

References

• https://nvd.nist.gov/vuln/detail/CVE-2019-16239
• https://lists.debian.org/debian-lts-announce/2019/10/msg00003.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FX56KYWC7X4ETV4P6HGJC7GZUEBITBBS/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HDMZGNBLZZKAGBI2PNXYWWKLD2LXKFH6/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WI7ZENFAWCHF2RU4NHPL2CU4WGZ4BNDJ/
• https://seclists.org/bugtraq/2020/Jan/31
• https://t2.fi/schedule/2019/
• https://usn.ubuntu.com/4565-1/
• https://www.debian.org/security/2020/dsa-4607
• http://lists.infradead.org/pipermail/openconnect-devel/2019-September/005412.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00060.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00061.html