VAR-201008-0304
Vulnerability from variot - Updated: 2025-04-11 23:05The webdav_mount function in webdav_vfsops.c in the WebDAV kernel extension (aka webdav_fs.kext) for Mac OS X 10.6 allows local users to cause a denial of service (panic) via a mount request with a large integer in the pa_socket_namelen field. Attackers can exploit this issue to trigger a kernel panic resulting in a denial-of-service condition. Mac OS X is a BSD-derived operating system developed and maintained by Apple.
==Notes on Disclosure==
My disclosure of this issue prior to an official fix is not meant to be taken as a statement against Apple's management of security issues. Local denial-of-service issues are by nature low impact - many security teams do not regard these as security-relevant at all.\xa0 I believe the chances of exploitation of this in real life are practically non-existent.\xa0 Given that the vulnerability resides in an open source kernel extension, I chose to disclose this issue so that concerned administrators can apply a fix immediately, while the rest of us can benefit from a little increased awareness of potentially unsafe memory allocation situations.\xa0 Apple's security team was contacted prior to disclosure, and I'm sure they'll incorporate a fix in a future release.
==Solution==
The WebDAV kernel extension can be obtained online [2].\xa0 The following patch can be applied to this extension, after which it should be recompiled to replace the existing extension at /System/Library/Extensions/webdav_fs.kext:
--- webdav_fs.kextproj.orig/webdav_fs.kmodproj/webdav_vfsops.c 2010-07-21 09:51:09.000000000 -0400 +++ webdav_fs.kextproj/webdav_fs.kmodproj/webdav_vfsops.c 2010-07-21 10:32:43.000000000 -0400 @@ -319,6 +319,12 @@ static int webdav_mount(struct mount *mp \xa0\xa0\xa0\xa0 }
\xa0\xa0\xa0\xa0 / Get the server sockaddr from the args / +\xa0\xa0\xa0 if(args.pa_socket_namelen > NAME_MAX) +\xa0\xa0\xa0 { +\xa0\xa0\xa0 \xa0\xa0\xa0 error = EINVAL; +\xa0\xa0\xa0 \xa0\xa0\xa0 goto bad; +\xa0\xa0\xa0 } + \xa0\xa0\xa0\xa0 MALLOC(fmp->pm_socket_name, struct sockaddr *, args.pa_socket_namelen, M_TEMP, M_WAITOK); \xa0\xa0\xa0\xa0 error = copyin(args.pa_socket_name, fmp->pm_socket_name, args.pa_socket_namelen); \xa0\xa0\xa0\xa0 if (error)
==Credits==
This vulnerability was discovered by Dan Rosenberg (dan.j.rosenberg@gmail.com).
==References==
CVE identifier CVE-2010-1794 has been assigned to this issue by Apple.
[1] http://en.wikipedia.org/wiki/WebDAV [2] http://opensource.apple.com/source/webdavfs/webdavfs-293/webdav_fs.kextproj/webdav_fs.kmodproj/
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"data": "The webdav_mount function in webdav_vfsops.c in the WebDAV kernel extension (aka webdav_fs.kext) for Mac OS X 10.6 allows local users to cause a denial of service (panic) via a mount request with a large integer in the pa_socket_namelen field. \nAttackers can exploit this issue to trigger a kernel panic resulting in a denial-of-service condition. Mac OS X is a BSD-derived operating system developed and maintained by Apple. \n\n==Notes on Disclosure==\n\nMy disclosure of this issue prior to an official fix is not meant to\nbe taken as a statement against Apple\u0027s management of security issues. \n Local denial-of-service issues are by nature low impact - many\nsecurity teams do not regard these as security-relevant at all.\\xa0 I\nbelieve the chances of exploitation of this in real life are\npractically non-existent.\\xa0 Given that the vulnerability resides in an\nopen source kernel extension, I chose to disclose this issue so that\nconcerned administrators can apply a fix immediately, while the rest\nof us can benefit from a little increased awareness of potentially\nunsafe memory allocation situations.\\xa0 Apple\u0027s security team was\ncontacted prior to disclosure, and I\u0027m sure they\u0027ll incorporate a fix\nin a future release. \n\n==Solution==\n\nThe WebDAV kernel extension can be obtained online [2].\\xa0 The following\npatch can be applied to this extension, after which it should be\nrecompiled to replace the existing extension at\n/System/Library/Extensions/webdav_fs.kext:\n\n--- webdav_fs.kextproj.orig/webdav_fs.kmodproj/webdav_vfsops.c\n2010-07-21 09:51:09.000000000 -0400\n+++ webdav_fs.kextproj/webdav_fs.kmodproj/webdav_vfsops.c\n2010-07-21 10:32:43.000000000 -0400\n@@ -319,6 +319,12 @@ static int webdav_mount(struct mount *mp\n\\xa0\\xa0\\xa0\\xa0 }\n\n\\xa0\\xa0\\xa0\\xa0 /* Get the server sockaddr from the args */\n+\\xa0\\xa0\\xa0 if(args.pa_socket_namelen \u003e NAME_MAX)\n+\\xa0\\xa0\\xa0 {\n+\\xa0\\xa0\\xa0 \\xa0\\xa0\\xa0 error = EINVAL;\n+\\xa0\\xa0\\xa0 \\xa0\\xa0\\xa0 goto bad;\n+\\xa0\\xa0\\xa0 }\n+\n\\xa0\\xa0\\xa0\\xa0 MALLOC(fmp-\u003epm_socket_name, struct sockaddr *,\nargs.pa_socket_namelen, M_TEMP, M_WAITOK);\n\\xa0\\xa0\\xa0\\xa0 error = copyin(args.pa_socket_name, fmp-\u003epm_socket_name,\nargs.pa_socket_namelen);\n\\xa0\\xa0\\xa0\\xa0 if (error)\n\n\n==Credits==\n\nThis vulnerability was discovered by Dan Rosenberg (dan.j.rosenberg@gmail.com). \n\n==References==\n\nCVE identifier CVE-2010-1794 has been assigned to this issue by Apple. \n\n[1] http://en.wikipedia.org/wiki/WebDAV\n[2] http://opensource.apple.com/source/webdavfs/webdavfs-293/webdav_fs.kextproj/webdav_fs.kmodproj/\n",
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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