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CVE-2020-28949

HIGH
7.8
CVSS Score
Published: November 19, 2020 at 06:14 PM UTC
Updated: June 17, 2026 at 03:10 AM UTC
4 products affected across 4 vendorsDebian LinuxFedoraDrupal

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Severity
HIGH7.8
Exploitation
CISA KEV
Exploit prediction
EPSS 85%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score84.6%

EPSS (Exploit Prediction Scoring System) estimates a 84.6% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

PEAR Archive_Tar allows an unserialization attack because phar: is blocked but PHAR: is not blocked. PEAR stands for PHP Extension and Application Repository and it is an open-source framework and distribution system for reusable PHP components with known usage in third-party products such as Drupal Core and Red Hat Linux.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Unknown
Added to KEV
Aug 25, 2022
Remediation Due
Sep 15, 2022
1502 days overdue
Notes
https://pear.php.net/bugs/bug.php?id=27002, https://www.drupal.org/sa-core-2020-013, https://access.redhat.com/security/cve/cve-2020-28949
https://nvd.nist.gov/vuln/detail/CVE-2020-28949

Description

Archive_Tar through 1.4.10 has :// filename sanitization only to address phar attacks, and thus any other stream-wrapper attack (such as file:// to overwrite files) can still succeed.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
10.09.0
Drupal· Drupaldrupal
95%
7.0 ≤ v < 7.758.0.0 ≤ v < 8.9.108.8.0 ≤ v < 8.8.129.0.0 ≤ v < 9.0.9
Affected range stops below 7.75, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.8.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.9.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.0.9, so it looks safe — our inference, not a vendor statement
Fedora· Fedora Projectrpm
95%
32333435
Archive Tar· PHPdrupal
95%
v < 1.4.12
Affected range stops below 1.4.12, so it looks safe — our inference, not a vendor statement

References (13)

x_refsource_MISCExploitThird Party AdvisoryVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/161095/PEAR-Archive_Tar-Arbitrary-File-Write.html
x_refsource_MISCExploitIssue TrackingVendor Advisory
Source: [email protected]
https://github.com/pear/Archive_Tar/issues/33
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2020/11/msg00045.html
Vendor Advisoryx_refsource_FEDORAMailing ListThird Party Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42GPGVVFTLJYAKRI75IVB5R45NYQGEUR/
Vendor Advisoryx_refsource_FEDORAMailing ListThird Party Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4V35LBRM6HBCXBVCITKQ4UEBTXO2EG7B/
Vendor Advisoryx_refsource_FEDORAMailing ListThird Party Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5KSFM672XW3X6BR7TVKRD63SLZGKK437/
Vendor Advisoryx_refsource_FEDORAMailing ListThird Party Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KWM4CTMEGAC4I2CHYNJVSROY4CVXVEUT/
Vendor Advisoryx_refsource_FEDORAMailing ListThird Party Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NBYZSHYTIOBK6V7C4N7TP6KIKCRKLVWP/

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHCISA-ADP
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
NVD-CWE-noinfo

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