Fedora EPEL 8 update for opensmtpd



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2020-35679
CVE-2020-35680
CWE-ID CWE-401
CWE-476
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Fedora
Operating systems & Components / Operating system

opensmtpd
Operating systems & Components / Operating system package or component

Vendor Fedoraproject

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Memory leak

EUVDB-ID: #VU49180

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-2020-35679

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak in smtpd/table.c when processing messages. A remote attacker can send a specially crafted message and trigger the daemon to perform multiple regex lookups, which in turn will leak memory.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 8

opensmtpd: before 6.8.0p2-1.el8

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2021-83ab5bb91b


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) NULL pointer dereference

EUVDB-ID: #VU49179

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-35680

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in smtpd/lka_filter.c in certain configurations. A remote attacker can trigger denial of service conditions via a crafted pattern of client activity, because the filter state machine does not properly maintain the I/O channel between the SMTP engine and the filters layer.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 8

opensmtpd: before 6.8.0p2-1.el8

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2021-83ab5bb91b


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.



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