Fedora 35 update for kernel
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2021-43267 CVE-2021-3772 CVE-2021-42327 |
| CWE-ID | CWE-119 CWE-345 CWE-787 |
| Exploitation vector | Network |
| Public exploit |
Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #3 is available. |
| Vulnerable software |
Fedora Operating systems & Components / Operating system kernel Operating systems & Components / Operating system package or component |
| Vendor | Fedoraproject |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Buffer overflow
EUVDB-ID: #VU58209
Risk: Medium
CVSSv4.0: 7.4 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]
CVE-ID: CVE-2021-43267
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to insufficient validation of user-supplied input in net/tipc/crypto.c in the Linux kernel. The Transparent Inter-Process Communication (TIPC) functionality allows remote attackers to exploit insufficient validation of user-supplied sizes for the MSG_CRYPTO message type.
A remote attacker can send specially crafted MSG_CRYPTO messages to the affected system, trigger memory corruption and execute arbitrary code on the system.
Install updates from vendor's repository.
Vulnerable software versionsFedora: 35
kernel: before 5.14.16-301.fc35
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2021-a093973910
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
2) Insufficient verification of data authenticity
EUVDB-ID: #VU63835
Risk: Medium
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2021-3772
CWE-ID:
CWE-345 - Insufficient Verification of Data Authenticity
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service attack (DoS) on the target system.
The vulnerability exists due to insufficient verification of data authenticity in the Linux SCTP stack. A remote attacker can exploit this vulnerability to perform a denial of service attack.
Install updates from vendor's repository.
Vulnerable software versionsFedora: 35
kernel: before 5.14.16-301.fc35
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2021-a093973910
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.
3) Out-of-bounds write
EUVDB-ID: #VU92411
Risk: Low
CVSSv4.0: 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:P/U:Clear]
CVE-ID: CVE-2021-42327
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: Yes
DescriptionThe vulnerability allows a local privileged user to execute arbitrary code.
The vulnerability exists due to out-of-bounds write error. A local privileged user can execute arbitrary code.
MitigationInstall updates from vendor's repository.
Vulnerable software versionsFedora: 35
kernel: before 5.14.16-301.fc35
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2021-a093973910
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. However, proof of concept for this vulnerability is available.
