Gentoo update for RPM
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 4 |
| CVE-ID | CVE-2021-3521 CVE-2021-35937 CVE-2021-35938 CVE-2021-35939 |
| CWE-ID | CWE-347 CWE-367 CWE-59 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Gentoo Linux Operating systems & Components / Operating system app-arch/rpm Operating systems & Components / Operating system package or component |
| Vendor | Gentoo |
Security Bulletin
This security bulletin contains information about 4 vulnerabilities.
1) Improper Verification of Cryptographic Signature
EUVDB-ID: #VU59993
Risk: Medium
CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2021-3521
CWE-ID:
CWE-347 - Improper Verification of Cryptographic Signature
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to an error in RPM's signature functionality, as RPM does not check the binding signature of subkeys before importing them. A remote attacker with ability to add malicious subkey to a legitimate public key can run malicious code on the system.
Update the affected packages.
app-arch/rpm to version: 4.18.0
Gentoo Linux: All versions
app-arch/rpm: before 4.18.0
CPE2.3- cpe:2.3:o:gentoo:gentoo_linux:*:*:*:*:*:*:*:*
- cpe:2.3:o:gentoo:app-arch_rpm:*:*:*:*:*:gentoo_linux:*:*
https://security.gentoo.org/glsa/202210-22
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Time-of-check Time-of-use (TOCTOU) Race Condition
EUVDB-ID: #VU79522
Risk: Low
CVSSv4.0: 4.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2021-35937
CWE-ID:
CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Exploit availability: No
DescriptionThe vulnerability allows a local privileged user to escalate privileges on the system.
The vulnerability exist due to race condition. A local privileged user can bypass the checks that were introduced in response to CVE-2017-7500 and CVE-2017-7501, potentially gaining root privileges.
MitigationUpdate the affected packages.
app-arch/rpm to version: 4.18.0
Gentoo Linux: All versions
app-arch/rpm: before 4.18.0
CPE2.3- cpe:2.3:o:gentoo:gentoo_linux:*:*:*:*:*:*:*:*
- cpe:2.3:o:gentoo:app-arch_rpm:*:*:*:*:*:gentoo_linux:*:*
https://security.gentoo.org/glsa/202210-22
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Link following
EUVDB-ID: #VU79521
Risk: Low
CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2021-35938
CWE-ID:
CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Exploit availability: No
DescriptionThe vulnerability allows a local privileged user to escalate privileges on the system.
The vulnerability occurs when rpm sets the desired permissions and credentials after installing a file. A local privileged user can use this flaw to exchange the original file with a symbolic link to a security-critical file and escalate their privileges on the system.
MitigationUpdate the affected packages.
app-arch/rpm to version: 4.18.0
Gentoo Linux: All versions
app-arch/rpm: before 4.18.0
CPE2.3- cpe:2.3:o:gentoo:gentoo_linux:*:*:*:*:*:*:*:*
- cpe:2.3:o:gentoo:app-arch_rpm:*:*:*:*:*:gentoo_linux:*:*
https://security.gentoo.org/glsa/202210-22
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
4) Link following
EUVDB-ID: #VU79523
Risk: Low
CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2021-35939
CWE-ID:
CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Exploit availability: No
DescriptionThe vulnerability allows a local privileged user to escalate privileges on the system.
The vulnerability exist due to fix for CVE-2017-7500 and CVE-2017-7501 was incomplete: the check was only implemented for the parent directory of the file to be created. A local privileged user who owns another ancestor directory could potentially use this flaw to gain root privileges.
MitigationUpdate the affected packages.
app-arch/rpm to version: 4.18.0
Gentoo Linux: All versions
app-arch/rpm: before 4.18.0
CPE2.3- cpe:2.3:o:gentoo:gentoo_linux:*:*:*:*:*:*:*:*
- cpe:2.3:o:gentoo:app-arch_rpm:*:*:*:*:*:gentoo_linux:*:*
https://security.gentoo.org/glsa/202210-22
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
