The set_fat function in fat.c in dosfstools before 4.0 might allow attackers to corrupt a FAT12 filesystem or cause a denial of service (invalid memory read and crash) by writing an odd number of clusters to the third to last entry on a FAT12 filesystem, which triggers an "off-by-two error."

It was discovered that there was both an invalid memory and heap overflow vulnerability in dosfstools, a collection of utilities for making and checking MS-DOS FAT filesystems.

For Debian 8 'Jessie', these problems have been fixed in version 3.0.27-1+deb8u1.

We recommend that you upgrade your dosfstools packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the dosfstools package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - The read_boot function in boot.c in dosfstools before     4.0 allows attackers to cause a denial of service     (crash) via a crafted filesystem, which triggers a     heap-based buffer overflow in the (1) read_fat function     or an out-of-bounds heap read in (2) get_fat     function.(CVE-2016-4804)

  - The set_fat function in fat.c in dosfstools before 4.0     might allow attackers to corrupt a FAT12 filesystem or     cause a denial of service (invalid memory read and     crash) by writing an odd number of clusters to the     third to last entry on a FAT12 filesystem, which     triggers an 'off-by-two error.'(CVE-2015-8872)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the dosfstools package installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - The read_boot function in boot.c in dosfstools before     4.0 allows attackers to cause a denial of service     (crash) via a crafted filesystem, which triggers a     heap-based buffer overflow in the (1) read_fat function     or an out-of-bounds heap read in (2) get_fat     function.(CVE-2016-4804)

  - The set_fat function in fat.c in dosfstools before 4.0     might allow attackers to corrupt a FAT12 filesystem or     cause a denial of service (invalid memory read and     crash) by writing an odd number of clusters to the     third to last entry on a FAT12 filesystem, which     triggers an 'off-by-two error.'(CVE-2015-8872)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the dosfstools package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - The read_boot function in boot.c in dosfstools before     4.0 allows attackers to cause a denial of service     (crash) via a crafted filesystem, which triggers a     heap-based buffer overflow in the (1) read_fat function     or an out-of-bounds heap read in (2) get_fat     function.(CVE-2016-4804)

  - The set_fat function in fat.c in dosfstools before 4.0     might allow attackers to corrupt a FAT12 filesystem or     cause a denial of service (invalid memory read and     crash) by writing an odd number of clusters to the     third to last entry on a FAT12 filesystem, which     triggers an 'off-by-two error.'(CVE-2015-8872)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the dosfstools package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - The set_fat function in fat.c in dosfstools before 4.0     might allow attackers to corrupt a FAT12 filesystem or     cause a denial of service (invalid memory read and     crash) by writing an odd number of clusters to the     third to last entry on a FAT12 filesystem, which     triggers an 'off-by-two error.'(CVE-2015-8872)

  - The read_boot function in boot.c in dosfstools before     4.0 allows attackers to cause a denial of service     (crash) via a crafted filesystem, which triggers a     heap-based buffer overflow in the (1) read_fat function     or an out-of-bounds heap read in (2) get_fat     function.(CVE-2016-4804)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

dosfstools was updated to fix two security issues.

These security issues were fixed :

  - CVE-2015-8872: The set_fat function in fat.c in     dosfstools might have allowed attackers to corrupt a     FAT12 filesystem or cause a denial of service (invalid     memory read and crash) by writing an odd number of     clusters to the third to last entry on a FAT12     filesystem, which triggers an 'off-by-two error     (bsc#980364).

  - CVE-2016-4804: The read_boot function in boot.c in     dosfstools allowed attackers to cause a denial of     service (crash) via a crafted filesystem, which triggers     a heap-based buffer overflow in the (1) read_fat     function or an out-of-bounds heap read in (2) get_fat     function (bsc#980377).

This non-security issue was fixed :

  - bsc#912607: Attempt to rename root dir in fsck due to     uninitialized fields. This update was imported from the     SUSE:SLE-12:Update update project.

dosfstools was updated to fix two security issues. These security issues were fixed :

  - CVE-2015-8872: The set_fat function in fat.c in     dosfstools might have allowed attackers to corrupt a     FAT12 filesystem or cause a denial of service (invalid     memory read and crash) by writing an odd number of     clusters to the third to last entry on a FAT12     filesystem, which triggers an 'off-by-two error     (bsc#980364).

  - CVE-2016-4804: The read_boot function in boot.c in     dosfstools allowed attackers to cause a denial of     service (crash) via a crafted filesystem, which triggers     a heap-based buffer overflow in the (1) read_fat     function or an out-of-bounds heap read in (2) get_fat     function (bsc#980377).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

dosfstools was updated to fix two security issues. These security issues were fixed :

  - CVE-2015-8872: The set_fat function in fat.c in     dosfstools might have allowed attackers to corrupt a     FAT12 filesystem or cause a denial of service (invalid     memory read and crash) by writing an odd number of     clusters to the third to last entry on a FAT12     filesystem, which triggers an 'off-by-two error     (bsc#980364).

  - CVE-2016-4804: The read_boot function in boot.c in     dosfstools allowed attackers to cause a denial of     service (crash) via a crafted filesystem, which triggers     a heap-based buffer overflow in the (1) read_fat     function or an out-of-bounds heap read in (2) get_fat     function (bsc#980377).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This is an update fixing off-by-2 error leading to corruption in FAT12 ( CVE-2015-8872) and heap-buffer-overflows in read_fat() and get_fat() functions (CVE-2016-4804).

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for dosfstools fixes the following issues :

  - fixed buffer overflows based on insufficient size of     variable for storing FAT size (CVE-2016-4804,     boo#980377)

  - dosfstools-3.0.26-read-fat-overflow.patch

  - fixed memory corruption when setting FAT12 entries     (CVE-2015-8872, boo#980364)

  - dosfstools-3.0.26-off-by-2.patch

  - Fix attempt to rename root dir in fsck due to     uninitialized fields [boo#912607]

  - Drop gpg-offline build-time requirement; this is now     handled by the local source validator

Hanno Bock discovered that dosfstools incorrectly handled certain malformed filesystems. A local attacker could use this issue to cause dosfstools to crash, resulting in a denial of service, or possibly execute arbitrary code.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
136980	Debian DLA-2224-1 : dosfstools security update	Nessus	Debian Local Security Checks	medium
135620	EulerOS Virtualization 3.0.2.2 : dosfstools (EulerOS-SA-2020-1458)	Nessus	Huawei Local Security Checks	medium
134519	EulerOS Virtualization for ARM 64 3.0.2.0 : dosfstools (EulerOS-SA-2020-1230)	Nessus	Huawei Local Security Checks	medium
132287	EulerOS 2.0 SP3 : dosfstools (EulerOS-SA-2019-2570)	Nessus	Huawei Local Security Checks	medium
131848	EulerOS 2.0 SP2 : dosfstools (EulerOS-SA-2019-2356)	Nessus	Huawei Local Security Checks	medium
129118	EulerOS 2.0 SP5 : dosfstools (EulerOS-SA-2019-1961)	Nessus	Huawei Local Security Checks	medium
93335	openSUSE Security Update : dosfstools (openSUSE-2016-1045)	Nessus	SuSE Local Security Checks	medium
93305	SUSE SLES11 Security Update : dosfstools (SUSE-SU-2016:2146-1)	Nessus	SuSE Local Security Checks	medium
93304	SUSE SLED12 / SLES12 Security Update : dosfstools (SUSE-SU-2016:2145-1)	Nessus	SuSE Local Security Checks	medium
92209	Fedora 24 : dosfstools (2016-f695b1a747)	Nessus	Fedora Local Security Checks	medium
92203	Fedora 22 : dosfstools (2016-f3262abda6)	Nessus	Fedora Local Security Checks	medium
92188	Fedora 23 : dosfstools (2016-e2d635cbf8)	Nessus	Fedora Local Security Checks	medium
91439	openSUSE Security Update : dosfstools (openSUSE-2016-671)	Nessus	SuSE Local Security Checks	medium
91422	Ubuntu 14.04 LTS / 16.04 LTS : dosfstools vulnerabilities (USN-2986-1)	Nessus	Ubuntu Local Security Checks	medium

Detections

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CVE-2015-8872

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