CVEvulnerability

CVE-2020-5202

5.5 MEDIUM Published 2020-01-21 Modified 2026-06-17 Official page ↗

Status: Modified
Published: 2020-01-21
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 ([email protected]): 5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0 ([email protected]): 2.1 LOW — AV:L/AC:L/Au:N/C:P/I:N/A:N

Description

apt-cacher-ng through 3.3 allows local users to obtain sensitive information by hijacking the hardcoded TCP port. The /usr/lib/apt-cacher-ng/acngtool program attempts to connect to apt-cacher-ng via TCP on localhost port 3142, even if the explicit SocketPath=/var/run/apt-cacher-ng/socket command-line option is passed. The cron job /etc/cron.daily/apt-cacher-ng (which is active by default) attempts this periodically. Because 3142 is an unprivileged port, any local user can try to bind to this port and will receive requests from acngtool. There can be sensitive data in these requests, e.g., if AdminAuth is enabled in /etc/apt-cacher-ng/security.conf. This sensitive data can leak to unprivileged local users that manage to bind to this port before the apt-cacher-ng daemon can.

Affected configurations

• apt-cacher-ng project apt-cacher-ng (<= 3.3) • debian debian linux 8.0 • debian debian linux 9.0 • debian debian linux 10.0 • opensuse backports sle-15 • opensuse leap 15.1

References

http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00057.html Mailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00065.html Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/20/4 Exploit, Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/20/4 Exploit, Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/20/4 Exploit, Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/20/4 Exploit, Mailing List, Third Party Advisory
https://seclists.org/oss-sec/2020/q1/21 Exploit, Mailing List, Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2020-5202 Patch, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00057.html Mailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00065.html Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/20/4 Exploit, Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/20/4 Exploit, Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/20/4 Exploit, Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/01/20/4 Exploit, Mailing List, Third Party Advisory
https://seclists.org/oss-sec/2020/q1/21 Exploit, Mailing List, Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2020-5202 Patch, Third Party Advisory