CVE-2021-31810

NameCVE-2021-31810
DescriptionAn 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).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2780-1
NVD severitymedium
Debian Bugs990815

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
jruby (PTS)stretch1.7.26-1+deb9u1vulnerable
stretch (security)1.7.26-1+deb9u3vulnerable
sid, buster9.1.17.0-3vulnerable
ruby2.3 (PTS)stretch2.3.3-1+deb9u8vulnerable
stretch (security)2.3.3-1+deb9u10fixed
ruby2.5 (PTS)buster2.5.5-3+deb10u3vulnerable
buster (security)2.5.5-3+deb10u2vulnerable
ruby2.7 (PTS)bookworm, sid, bullseye2.7.4-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
jrubysource(unstable)(unfixed)
ruby2.3sourcestretch2.3.3-1+deb9u10DLA-2780-1
ruby2.3source(unstable)(unfixed)
ruby2.5source(unstable)(unfixed)
ruby2.7source(unstable)2.7.4-1990815

Notes

[buster] - ruby2.5 <no-dsa> (Minor issue)
[buster] - jruby <no-dsa> (Minor issue)
[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)

Search for package or bug name: Reporting problems