Linux Kernel 5.0.21 ext4 Image fs/ext4/xattr.c ext4_xattr_set_entry out-of-bounds write

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel 5.0.21. Affected by this issue is the function ext4_xattr_set_entry of the file fs/ext4/xattr.c of the component ext4 Image Handler. The manipulation leads to out-of-bounds write. This vulnerability is uniquely identified as CVE-2019-19319. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel 5.0.21 (Operating System). This issue affects the function ext4_xattr_set_entry of the file fs/ext4/xattr.c of the component ext4 Image Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel 5.0.21, a setxattr operation, after a mount of a crafted ext4 image, can cause a slab-out-of-bounds write access because of an ext4_xattr_set_entry use-after-free in fs/ext4/xattr.c when a large old_size value is used in a memset call.

The weakness was disclosed 11/27/2019. The identification of this vulnerability is CVE-2019-19319 since 11/26/2019. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 02/28/2024).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The entries VDB-146476 and VDB-146473 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.0.21

License

• open-source

Website

• Vendor: https://www.kernel.org/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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