Use of externally-controlled format string in Exim - CVE-2011-1764
Published: April 24, 2018
Vulnerability identifier: #VU12130
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2011-1764
CWE-ID: CWE-134
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Exim
Affected software:
Exim
Exim
Detailed vulnerability description
The vulnerability allows a remote attacker to cause DoS condition or execute arbitrary code on the target system.
The weakness exists in the dkim_exim_verify_finish function in src/dkim.c due to use of externally-controlled format string. A remote attacker can cause the service to crash or execute arbitrary code via format string specifiers in data used in DKIM logging, as demonstrated by an identity field containing a % (percent) character.
Successful exploitation of the vulnerability may result in system compromise.
The weakness exists in the dkim_exim_verify_finish function in src/dkim.c due to use of externally-controlled format string. A remote attacker can cause the service to crash or execute arbitrary code via format string specifiers in data used in DKIM logging, as demonstrated by an identity field containing a % (percent) character.
Successful exploitation of the vulnerability may result in system compromise.
How to mitigate CVE-2011-1764
Update to version 4.76.