Heap-based buffer overflow in Exim - CVE-2012-5671
Published: October 31, 2012 / Updated: September 28, 2021
Vulnerability identifier: #VU43366
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2012-5671
CWE-ID: CWE-122
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 execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in Heap-based buffer overflow in the dkim_exim_query_dns_txt function in dkim.c in Exim 4.70 through 4.80, when DKIM support is enabled and acl_smtp_connect and acl_smtp_rcpt are not set to "warn control = dkim_disable_verify,". A remote attacker can use an email from a malicious DNS server. to trigger heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
How to mitigate CVE-2012-5671
Install update from vendor's website.
Sources
- http://lists.fedoraproject.org/pipermail/package-announce/2012-November/091664.html
- http://lists.fedoraproject.org/pipermail/package-announce/2012-October/090900.html
- http://lists.fedoraproject.org/pipermail/package-announce/2012-October/090963.html
- http://lists.opensuse.org/opensuse-security-announce/2012-10/msg00018.html
- http://osvdb.org/86616
- http://secunia.com/advisories/51098
- http://secunia.com/advisories/51115
- http://secunia.com/advisories/51153
- http://secunia.com/advisories/51155
- http://www.debian.org/security/2012/dsa-2566
- http://www.openwall.com/lists/oss-security/2012/10/26/5
- http://www.securityfocus.com/bid/56285
- http://www.ubuntu.com/usn/USN-1618-1
- https://exchange.xforce.ibmcloud.com/vulnerabilities/79615
- https://lists.exim.org/lurker/message/20121026.080330.74b9147b.en.html