Georgi Guninski has reported two vulnerabilities in exim, which potentially can be exploited by malicious people to compromise a vulnerable system.
1) A boundary error within the verification of sender addresses can be exploited to cause a buffer overflow. Successful exploitation allows execution of arbitrary code, but requires that the setting "sender_verify" is set to "true" (not default setting) in the configuration file.
This vulnerability has been reported in version 3.35 and may also affect other versions. Version 4.32 is reportedly not vulnerable.
2) A boundary error within a routine for header syntax checking can be exploited to cause a buffer overflow. Successful exploitation may potentially allow execution of arbitrary code but requires that "headers_check_syntax" / "require verify = header_syntax" is enabled (not default setting) in the configuration file.
This vulnerability has been reported in versions 3.35 and 4.32. Other versions are likely also affected.
Solution: Upgrade to version 4.32 and disable header syntax checking in "exim.conf" if enabled.
Provided and/or discovered by: Georgi Guninski
Original Advisory: http://www.guninski.com/exim1.html
Do you have additional information related to this advisory?
Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this
information to firstname.lastname@example.org
Subject: Exim Buffer Overflow Vulnerabilities
No posts yet
You must be logged in to post a comment.
Secunia Customer Login
Not a customer already?
Learn more about how our market leading Vulnerability Management solutions can help you manage risk and ensure compliance.