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Fencer Intel
high 7.8

CVE-2020-28948 in the critical feed json

Multiple vulnerabilities through filename manipulation in Archive_Tar

published 5y ago modified last mo. also BIT-drupal-2020-28948 , BIT-drupal-2020-28949 , CVE-2020-28949 , DRUPAL-CORE-2020-013 , EUVD-2021-0841 , GHSA-75c5-f4gw-38r9 , GHSA-jh5x-hfhg-78jq

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
47.5%
EPSS 47.5% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

Archive_Tar through 1.4.10 allows an unserialization attack because phar: is blocked but PHAR: is not blocked.

Patch / fix

  • packagist pear/archive_tar 1.4.11
  • bitnami drupal 7.75.0, 8.9.10, 9.0.9
  • packagist drupal/core 8.8.12, 8.9.10, 9.0.9
  • php archive_tar 1.4.11
  • drupal drupal 7.75, 8.8.12, 8.9.10, 9.0.9
  • php-pear Debian 14, Debian 13, Debian 12 1:1.10.9+submodules+notgz-1.1

debian advisories DEBIAN-CVE-2020-28948

  • php-pear Ubuntu 16.04 LTS 1:1.10.1+submodules+notgz-6ubuntu0.2
  • php-pear Ubuntu 18.04 LTS 1:1.10.5+submodules+notgz-1ubuntu1.18.04.2
  • php-pear Ubuntu 20.04 LTS 1:1.10.9+submodules+notgz-1ubuntu0.20.04.1
  • drupal7 Ubuntu Pro 14.04 LTS 7.26-1ubuntu0.1+esm2
  • drupal7 Ubuntu Pro 16.04 LTS 7.44-1ubuntu1~16.04.0+esm2

ubuntu advisories UBUNTU-CVE-2020-28948

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • php-pear RHEL 7 1:1.9.4-23.el7_9
  • libzip RHEL 8, RHEL 8.4 EUS 1.6.1-1.module+el8.3.0+6678+b09f589e
  • php RHEL 8 7.4.19-4.module+el8.6.0+16316+906f6c6d
  • php-gd RHEL 8 7.4.19-4.module+el8.6.0+16316+906f6c6d
  • php-cli RHEL 8 7.4.19-4.module+el8.6.0+16316+906f6c6d
  • php-dba RHEL 8 7.4.19-4.module+el8.6.0+16316+906f6c6d
  • php-dbg RHEL 8 7.4.19-4.module+el8.6.0+16316+906f6c6d
  • php-ffi RHEL 8 7.4.19-4.module+el8.6.0+16316+906f6c6d

red hat advisories RHSA-2022:7340RHSA-2022:6541RHSA-2022:6542

  • php AlmaLinux 8 7.4.19-4.module_el8.6.0+3238+624bf8b8
  • php AlmaLinux 8 7.4.19-4.module_el8.6.0+3239+bedf0508
  • libzip AlmaLinux 8 1.6.1-1.module_el8.6.0+2750+78feabcb
  • libzip AlmaLinux 8 1.6.1-1.module_el8.6.0+3239+bedf0508
  • php-gd AlmaLinux 8 7.4.19-4.module_el8.6.0+3238+624bf8b8
  • php-gd AlmaLinux 8 7.4.19-4.module_el8.6.0+3239+bedf0508
  • php-cli AlmaLinux 8 7.4.19-4.module_el8.6.0+3239+bedf0508
  • php-cli AlmaLinux 8 7.4.19-4.module_el8.6.0+3238+624bf8b8

almalinux advisories ALSA-2022:6542

  • php Rocky Linux 8 7.4.19-4.module+el8.6.0+1006+0d5a469f
  • libzip Rocky Linux 8 1.6.1-1.module+el8.6.0+789+2130c178
  • libzip Rocky Linux 8 1.6.1-1.module+el8.4.0+415+e936cba3
  • php-pear Rocky Linux 8 1:1.10.13-1.module+el8.7.0+1067+0a7071cc
  • php-pear Rocky Linux 8 1:1.10.13-1.module+el8.6.0+1006+0d5a469f
  • php-pecl-rrd Rocky Linux 8 2.0.1-1.module+el8.4.0+414+2e7afcdd
  • php-pecl-zip Rocky Linux 8 1.18.2-1.module+el8.6.0+789+2130c178
  • php-pecl-zip Rocky Linux 8 1.18.2-1.module+el8.4.0+415+e936cba3

rocky linux advisories RLSA-2022:6542

  • drupal7 Alpine 3.20, Alpine 3.19, Alpine 3.18 +7 more 7.75-r0

alpine advisories ALPINE-CVE-2020-28948

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2020-28948 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-28948 updated cvss 7.8

Archive_Tar: allows an unserialization attack because phar: is blocked but PHAR: is not blocked

  • Red Hat Enterprise Linux 6 php-pear
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 php-pear Red Hat Software Collections rh-php73-php-pear
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) php 7.4.19-4.module+el8.6.0+16316+906f6c6d, libzip 1.6.1-1.module+el8.3.0+6678+b09f589e, php-gd 7.4.19-4.module+el8.6.0+16316+906f6c6d, php-cli 7.4.19-4.module+el8.6.0+16316+906f6c6d, php-dba 7.4.19-4.module+el8.6.0+16316+906f6c6d, php-dbg 7.4.19-4.module+el8.6.0+16316+906f6c6d, +28 more
    fixed: vendor fix RHSA-2022:6542
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) php 7.4.6-5.module+el8.4.0+15727+276bb227, libzip 1.6.1-1.module+el8.3.0+6678+b09f589e, php-gd 7.4.6-5.module+el8.4.0+15727+276bb227, php-cli 7.4.6-5.module+el8.4.0+15727+276bb227, php-dba 7.4.6-5.module+el8.4.0+15727+276bb227, php-dbg 7.4.6-5.module+el8.4.0+15727+276bb227, +28 more
    fixed: vendor fix RHSA-2022:6541
  • Red Hat Enterprise Linux Server (v. 7) php-pear 1.9.4-23.el7_9 Red Hat Enterprise Linux Workstation (v. 7) php-pear 1.9.4-23.el7_9
    fixed: vendor fix RHSA-2022:7340

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

47.49% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/pear/Archive_Tar/issues/33 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
GitHub 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H
GitHub 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P
OSV 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist pear/archive_tar
<1.4.11
1.4.11
bitnami drupal
>=7.0.0, <7.75.0
>=8.0.0, <8.9.10
>=9.0.0, <9.0.9
7.75.0
8.9.10
9.0.9
packagist drupal/core
>=8.0.0, <8.8.12
>=8.9.0, <8.9.10
>=9.0.0, <9.0.9
8.8.12
8.9.10
9.0.9

Classification

Weakness
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.