Debian update for exim4
| Risk | Critical |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2023-42114 CVE-2023-42115 CVE-2023-42116 |
| CWE-ID | CWE-125 CWE-787 CWE-121 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Debian Linux Operating systems & Components / Operating system exim4 (Debian package) Operating systems & Components / Operating system package or component |
| Vendor | Debian |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) 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.
MitigationUpdate exim4 package to one of the following versions: 4.94.2-7+deb11u1, 4.96-15+deb12u2.
Vulnerable software versionsDebian Linux: All versions
exim4 (Debian package): before 4.96-15+deb12u2
External linkshttp://www.debian.org/security/2023/dsa-5512
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) 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.
MitigationUpdate exim4 package to one of the following versions: 4.94.2-7+deb11u1, 4.96-15+deb12u2.
Vulnerable software versionsDebian Linux: All versions
exim4 (Debian package): before 4.96-15+deb12u2
External linkshttp://www.debian.org/security/2023/dsa-5512
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) 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.
Update exim4 package to one of the following versions: 4.94.2-7+deb11u1, 4.96-15+deb12u2.
Vulnerable software versionsDebian Linux: All versions
exim4 (Debian package): before 4.96-15+deb12u2
External linkshttp://www.debian.org/security/2023/dsa-5512
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.
