CVE-2021-3521
"RPM OpenPGP Subkey Flooding Vulnerability"
Description
There is a flaw in RPM's signature functionality. OpenPGP subkeys are associated with a primary key via a "binding signature." RPM does not check the binding signature of subkeys prior to importing them. If an attacker is able to add or socially engineer another party to add a malicious subkey to a legitimate public key, RPM could wrongly trust a malicious signature. The greatest impact of this flaw is to data integrity. To exploit this flaw, an attacker must either compromise an RPM repository or convince an administrator to install an untrusted RPM or public key. It is strongly recommended to only use RPMs and public keys from trusted sources.
INFO
Published Date :
Aug. 22, 2022, 3:15 p.m.
Last Modified :
Feb. 12, 2023, 11:41 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.0
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-3521.
| URL | Resource |
|---|---|
| https://access.redhat.com/security/cve/CVE-2021-3521 | Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1941098 | Issue Tracking Patch Third Party Advisory |
| https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8 | Patch Third Party Advisory |
| https://github.com/rpm-software-management/rpm/pull/1795/ | Patch Third Party Advisory |
| https://security.gentoo.org/glsa/202210-22 | Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-3521 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-3521 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Feb. 12, 2023
Action Type Old Value New Value Changed Description There is a flaw in RPM's signature functionality. OpenPGP subkeys are associated with a primary key via a "binding signature."[1] RPM does not check the binding signature of subkeys prior to importing them. If an attacker is able to add or socially engineer another party to add a malicious subkey to a legitimate public key, RPM could wrongly trust a malicious signature. The greatest impact of this flaw is to data integrity. 1. https://tools.ietf.org/html/rfc4880#section-5.2.1 There is a flaw in RPM's signature functionality. OpenPGP subkeys are associated with a primary key via a "binding signature." RPM does not check the binding signature of subkeys prior to importing them. If an attacker is able to add or socially engineer another party to add a malicious subkey to a legitimate public key, RPM could wrongly trust a malicious signature. The greatest impact of this flaw is to data integrity. To exploit this flaw, an attacker must either compromise an RPM repository or convince an administrator to install an untrusted RPM or public key. It is strongly recommended to only use RPMs and public keys from trusted sources. Removed CVSS V3.1 Red Hat, Inc. AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N Removed Reference https://access.redhat.com/errata/RHSA-2022:0254 [No Types Assigned] Removed Reference https://access.redhat.com/errata/RHSA-2022:0368 [No Types Assigned] Removed Reference https://access.redhat.com/errata/RHSA-2022:0634 [No Types Assigned] Added CWE Red Hat, Inc. CWE-347 -
CVE Modified by [email protected]
Feb. 02, 2023
Action Type Old Value New Value Changed Description There is a flaw in RPM's signature functionality. OpenPGP subkeys are associated with a primary key via a "binding signature." RPM does not check the binding signature of subkeys prior to importing them. If an attacker is able to add or socially engineer another party to add a malicious subkey to a legitimate public key, RPM could wrongly trust a malicious signature. The greatest impact of this flaw is to data integrity. To exploit this flaw, an attacker must either compromise an RPM repository or convince an administrator to install an untrusted RPM or public key. It is strongly recommended to only use RPMs and public keys from trusted sources. There is a flaw in RPM's signature functionality. OpenPGP subkeys are associated with a primary key via a "binding signature."[1] RPM does not check the binding signature of subkeys prior to importing them. If an attacker is able to add or socially engineer another party to add a malicious subkey to a legitimate public key, RPM could wrongly trust a malicious signature. The greatest impact of this flaw is to data integrity. 1. https://tools.ietf.org/html/rfc4880#section-5.2.1 Added CVSS V3.1 Red Hat, Inc. AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N Added Reference https://access.redhat.com/errata/RHSA-2022:0634 [No Types Assigned] Added Reference https://access.redhat.com/errata/RHSA-2022:0368 [No Types Assigned] Added Reference https://access.redhat.com/errata/RHSA-2022:0254 [No Types Assigned] Removed CWE Red Hat, Inc. CWE-347 -
Modified Analysis by [email protected]
Dec. 03, 2022
Action Type Old Value New Value Changed Reference Type https://security.gentoo.org/glsa/202210-22 No Types Assigned https://security.gentoo.org/glsa/202210-22 Third Party Advisory -
CVE Modified by [email protected]
Oct. 31, 2022
Action Type Old Value New Value Added Reference https://security.gentoo.org/glsa/202210-22 [No Types Assigned] -
Reanalysis by [email protected]
Sep. 12, 2022
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:rpm:rpm:*:*:*:*:*:*:*:* versions up to (excluding) 4.18.0 OR *cpe:2.3:a:rpm:rpm:*:*:*:*:*:*:*:* versions up to (excluding) 4.17.1 -
Initial Analysis by [email protected]
Aug. 26, 2022
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N Changed Reference Type https://access.redhat.com/security/cve/CVE-2021-3521 No Types Assigned https://access.redhat.com/security/cve/CVE-2021-3521 Third Party Advisory Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=1941098 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=1941098 Issue Tracking, Patch, Third Party Advisory Changed Reference Type https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8 No Types Assigned https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8 Patch, Third Party Advisory Changed Reference Type https://github.com/rpm-software-management/rpm/pull/1795/ No Types Assigned https://github.com/rpm-software-management/rpm/pull/1795/ Patch, Third Party Advisory Added CWE NIST CWE-347 Added CPE Configuration OR *cpe:2.3:a:rpm:rpm:*:*:*:*:*:*:*:* versions up to (excluding) 4.18.0
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-3521 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-3521
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.07 }} 0.01%
score
0.29106
percentile