Multiple vulnerabilities in Exim
| Risk | Critical |
| Patch available | YES |
| Number of vulnerabilities | 6 |
| CVE-ID | CVE-2023-42119 CVE-2023-42118 CVE-2023-42117 CVE-2023-42116 CVE-2023-42115 CVE-2023-42114 |
| CWE-ID | CWE-125 CWE-191 CWE-119 CWE-121 CWE-787 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Exim Server applications / Mail servers |
| Vendor | Exim |
Security Bulletin
This security bulletin contains information about 6 vulnerabilities.
1) Out-of-bounds read
EUVDB-ID: #VU81256
Risk: Low
CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-42119
CWE-ID:
CWE-125 - Out-of-bounds read
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition in dnsdb implementation. A remote attacker can send specially crafted data to the server, trigger an out-of-bounds read error and read contents of memory on the system.
MitigationInstall update from vendor's website.
Vulnerable software versionsExim: 4.00 - 4.96
External linkshttp://www.zerodayinitiative.com/advisories/ZDI-23-1473/
http://www.exim.org/static/doc/security/CVE-2023-zdi.txt
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Integer underflow
EUVDB-ID: #VU81255
Risk: Critical
CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-42118
CWE-ID:
CWE-191 - Integer underflow
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to integer underflow in libspf2 when parsing SPF macros. A remote attacker can pass specially crafted data to the server, trigger an integer underflow and execute arbitrary code on the target system.
Install update from vendor's website.
Vulnerable software versionsExim: 4.00 - 4.96
External linkshttp://www.zerodayinitiative.com/advisories/ZDI-23-1472/
http://www.exim.org/static/doc/security/CVE-2023-zdi.txt
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Buffer overflow
EUVDB-ID: #VU81254
Risk: Critical
CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-42117
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error within the smtp service. A remote attacker can send specially crafted data to the server, trigger memory corruption and execute arbitrary code on the target system.
MitigationInstall update from vendor's website.
Vulnerable software versionsExim: 4.00 - 4.96
External linkshttp://www.zerodayinitiative.com/advisories/ZDI-23-1471/
http://www.exim.org/static/doc/security/CVE-2023-zdi.txt
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
4) Stack-based buffer overflow
EUVDB-ID: #VU81253
Risk: Critical
CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-42116
CWE-ID:
CWE-121 - Stack-based buffer overflow
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when handling NTLM challenge requests. A remote unauthenticated attacker can send specially crafted data to the server, trigger a stack-based buffer overflow and execute arbitrary code on the target system.
Install update from vendor's website.
Vulnerable software versionsExim: 4.00 - 4.96
External linkshttp://www.zerodayinitiative.com/advisories/ZDI-23-1470/
http://www.exim.org/static/doc/security/CVE-2023-zdi.txt
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
5) Out-of-bounds write
EUVDB-ID: #VU81252
Risk: Critical
CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-42115
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when handling AUTH command. A remote non-authenticated attacker can send specially crafted data to the server, trigger an out-of-bounds write and execute arbitrary code on the target system.
MitigationInstall update from vendor's website.
Vulnerable software versionsExim: 4.00 - 4.96
External linkshttp://www.zerodayinitiative.com/advisories/ZDI-23-1469/
http://www.exim.org/static/doc/security/CVE-2023-zdi.txt
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
6) Out-of-bounds read
EUVDB-ID: #VU81251
Risk: Low
CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-42114
CWE-ID:
CWE-125 - Out-of-bounds read
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition when handling NTLM challenge requests. A remote attacker can send specially crafted data to the server, trigger an out-of-bounds read error and read contents of memory on the system.
MitigationInstall update from vendor's website.
Vulnerable software versionsExim: 4.00 - 4.96
External linkshttp://www.zerodayinitiative.com/advisories/ZDI-23-1468/
http://www.exim.org/static/doc/security/CVE-2023-zdi.txt
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
