|Description||A use after free vulnerability exists in curl <7.87.0. Curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.|
|Source||CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)|
Vulnerable and fixed packages
The table below lists information on source packages.
|bullseye (security), bullseye||7.74.0-1.3+deb11u7||fixed|
The information below is based on the following data on fixed versions.
Introduced by (telnet): https://github.com/curl/curl/commit/b7eeb6e67fca686f840eacd6b8394edb58b07482 (curl-7_16_0)
Introduced by (smb): https://github.com/curl/curl/commit/aec2e865f06669b9cb5d26cc1148d70bc418b163 (curl-7_40_0)
Fixed by: https://github.com/curl/curl/commit/4f20188ac644afe174be6005ef4f6ffba232b8b2 (curl-7_87_0)