Apache mod_ssl Off-by-one Buffer Overflow in Processing CRLs May Let Remote Users Deny Service
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SecurityTracker Alert ID: 1014575
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SecurityTracker URL: http://securitytracker.com/id?1014575
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CVE Reference: CAN-2005-1268
(Links to External Site)
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Updated: Jul 27 2005
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Original Entry Date: Jul 26 2005
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Impact: Denial of service via network, Execution of arbitrary code via network, User access via network
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Fix Available: Yes
Vendor Confirmed: Yes
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Description: A vulnerability was reported in Apache mod_ssl in the processing of certificate revocation lists (CRLs). A remote user may be able to cause denial of service conditions.
A remote user can create a specially crafted CRL that, when processed by the Apache mod_ssl callback function, will trigger an off-by-one
buffer overflow. A remote user can cause the Apache server child process to crash.
The vulnerability can be triggered when printing
CRL information at the 'debug' LogLevel.
The vulnerability resides in 'ssl_engine_kernel.c' in the ssl_callback_SSLVerify_CRL()
function.
Marc Stern from CSC is credited with discovering this vulnerability.
[Editor's note: It is not clear if this vulnerability
can be exploited to execute arbitrary code or not. Several reports have indicated that denial of service is the most likely impact.]
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Impact: A remote user may be able to cause the affected Apache child process to crash.
[Editor's note: It is not clear if this vulnerability
can be exploited to execute arbitrary code or not. Several reports have indicated that denial of service is the most likely impact.]
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Solution: The vendor has issued a source code fix, available via SVN.
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Vendor URL: httpd.apache.org/ (Links to External Site)
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Cause: Boundary error
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Underlying OS: Linux (Any), UNIX (Any), Windows (Any)
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Message History:
None.
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Source Message Contents
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Date: Mon, 25 Jul 2005 22:03:42 -0400
Subject: [none]
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CVE: CAN-2005-1268
Red Hat wrote:
> Marc Stern reported an off-by-one overflow in the mod_ssl CRL verification
> callback. In order to exploit this issue the Apache server would need to be
> configured to use a malicious certificate revocation list (CRL)
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