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Exim Three Vulnerabilities
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Secunia Advisory:
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SA13713
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Release Date:
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2005-01-06
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Last Update:
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2005-01-28
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Popularity:
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10,168 views
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Critical:
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Moderately critical
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Impact:
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Privilege escalation
System access
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Exim 4.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| CVE reference: | CVE-2005-0021
CVE-2005-0022
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Description:
Three vulnerabilities have been reported in Exim, which potentially can be exploited by malicious, local users to gain escalated privileges and by malicious people to compromise a vulnerable system.
1) A boundary error in the function "host_aton()" when handling IPv6 addresses may be exploited to cause a buffer overflow by supplying a specially crafted IPv6 address with more than 8 components to an unspecified command line option.
2) A boundary error in the function "spa_base64_to_bits()" when handling SPA authentication can be exploited to cause a buffer overflow.
Successful exploitation requires that SPA authentication is enabled.
3) A boundary error in the "dns_build_reverse()" function can be exploited to cause a buffer overflow by passing an overly long string via a command line option.
Successful exploitation may allow execution of arbitrary code with escalated privileges.
The vulnerabilities have been reported in version 4.43 and prior.
Solution:
Update to version 4.44.
http://www.exim.org/mirrors.html
Provided and/or discovered by:
Discovered by anonymous person and reported via iDEFENSE.
Changelog:
2005-01-07: Added additional information and links to iDEFENSE advisories.
2005-01-17: Added information about third vulnerability.
2005-01-20: Updated "Solution" section.
2005-01-28: Added link to US-CERT vulnerability note.
Original Advisory:
Exim.org:
http://www.exim.org/mail-archives/exim-announce/2005/msg00000.html
iDEFENSE:
http://www.idefense.com/application/poi/display?id=178&type=vulnerabilities
http://www.idefense.com/application/poi/display?id=179&type=vulnerabilities
http://www.idefense.com/application/poi/display?id=183&type=vulnerabilities
Other References:
US-CERT VU#132992:
http://www.kb.cert.org/vuls/id/132992
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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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