CVE-2020-5202: apt-cacher-ng_project apt-cacher-ng
Vulnerability summary
CVE-2020-5202 is a medium (CVSS 5.5) vulnerability in apt-cacher-ng_project apt-cacher-ng. EPSS estimates a 0.47% chance of exploitation in the next 30 days, higher than 39.2% of scored vulnerabilities. 2 public exploits are recorded.
Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 21-01-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
0.47%
Chance of exploitation in the next 30 days
Percentile
39%
Versus all other CVEs
30-day change
0.00 pp
From 0.46% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
2 foundExploit Reference (openwall.com)
Maturity: unknown
Exploit Reference (seclists.org)
Maturity: unknown
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Debian2 products
- apt-cacher-ng< 3.3.1-1
- debian_linuxEOL8.0 | 9.0 | 10.0
Apt-cacher-ng_project1 product
- apt-cacher-ng≤ 3.3
Ubuntu1 product
- apt-cacher-ngAll versions (No fix recorded)
4 vendors · 6 products
References
8 links
- www.openwall.com/lists/oss-security/2020/01/20/4Mailing ListX Refsource MLISTExploitThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-01/msg00057.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-01/msg00065.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory