| Name | CVE-2021-31810 |
| Description | An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. A malicious FTP server can use the PASV response to trick Net::FTP into connecting back to a given IP address and port. This potentially makes curl extract information about services that are otherwise private and not disclosed (e.g., the attacker can conduct port scans and service banner extractions). |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2780-1, DLA-3408-1, DSA-5066-1 |
| Debian Bugs | 990815, 1014818 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| jruby (PTS) | bookworm | 9.3.9.0+ds-8 | fixed |
| sid, trixie | 9.4.8.0+ds-1 | fixed | |
| ruby2.7 (PTS) | bullseye | 2.7.4-1+deb11u1 | fixed |
| bullseye (security) | 2.7.4-1+deb11u2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| jruby | source | buster | 9.1.17.0-3+deb10u1 | DLA-3408-1 | ||
| jruby | source | (unstable) | 9.3.9.0+ds-1 | 1014818 | ||
| ruby2.3 | source | stretch | 2.3.3-1+deb9u10 | DLA-2780-1 | ||
| ruby2.3 | source | (unstable) | (unfixed) | |||
| ruby2.5 | source | buster | 2.5.5-3+deb10u4 | DSA-5066-1 | ||
| ruby2.5 | source | (unstable) | (unfixed) | |||
| ruby2.7 | source | (unstable) | 2.7.4-1 | 990815 |
[stretch] - jruby <no-dsa> (Minor issue)
https://www.ruby-lang.org/en/news/2021/07/07/trusting-pasv-responses-in-net-ftp/
https://github.com/ruby/ruby/commit/3ca1399150ed4eacfd2fe1ee251b966f8d1ee469 (2.7)