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Exim Buffer Overflow Vulnerabilities
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Secunia Advisory:
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SA11558
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Release Date:
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2004-05-06
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Last Update:
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2004-05-07
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Popularity:
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10,994 views
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Critical:
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Highly critical
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Impact:
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System access
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Where:
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From remote
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Solution Status:
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Partial Fix
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| Software: | Exim 3.x
Exim 4.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| CVE reference: | CVE-2004-0399
CVE-2004-0400
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Description:
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
Changelog:
2004-05-07: Added CVE references.
Original Advisory:
http://www.guninski.com/exim1.html
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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