cbcvebase.
CVE-2021-3521
published 2022-08-22

CVE-2021-3521: 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…

PriorityP420medium4.7CVSS 3.1
AVLACHPRNUIRSUCNIHAN
EPSS
0.30%
22.2th percentile
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.

Affected

8 ranges
VendorProductVersion rangeFixed in
debianrpm< rpm 4.18.0+dfsg-1 (bookworm)rpm 4.18.0+dfsg-1 (bookworm)
msrccbl2_rpm_4.18.0-1_on_cbl_mariner_2.0——
msrccm1_rpm_4.14.2-15_on_cbl_mariner_1.0——
rpmrpm< 4.17.14.17.1
rpmrpm——
rpmrpm>= 0 < 4.18.0+dfsg-14.18.0+dfsg-1
rpmrpm>= 0 < 4.18.0+dfsg-14.18.0+dfsg-1
rpmrpm>= 0 < 4.18.0+dfsg-14.18.0+dfsg-1

CVSS provenance

nvdv3.14.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
osv4.7MEDIUM
vendor_debian4.7MEDIUM
vendor_msrc4.7MEDIUM
vendor_redhat4.7MEDIUM
vendor_oracle4.4MEDIUM
Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.