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Vigil@nce: Linux kernel, privilege elevation via eCryptfs

August 2009 by Vigil@nce

A local attacker, allowed to mount a eCryptfs filesystem, can
generate an overflow in order to elevate his privileges.

Severity: 2/4

Consequences: administrator access/rights

Provenance: user shell

Means of attack: no proof of concept, no attack

Ability of attacker: expert (4/4)

Confidence: confirmed by the editor (5/5)

Diffusion of the vulnerable configuration: high (3/3)

Number of vulnerabilities in this bulletin: 2

Creation date: 29/07/2009

IMPACTED PRODUCTS

 Debian Linux
 Fedora
 Linux kernel
 Red Hat Enterprise Linux

DESCRIPTION OF THE VULNERABILITY

The Linux kernel supports the eCryptfs file system since version
2.6.19. This implementation has two vulnerabilities.

When the encryption key is superior to ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES,
an overflow occurs in the parse_tag_3_packet() function.
[grav:2/4; BID-35850, CVE-2009-2407, RISE-2009003]

When the size of data (tag11_contents_size) is superior to
max_contents_bytes, an overflow occurs in the parse_tag_1_packet()
function. [grav:2/4; BID-35851, CVE-2009-2406, RISE-2009002]

A local attacker, allowed to mount a malicious eCryptfs
filesystem, can therefore generate an overflow in order to elevate
his privileges.

CHARACTERISTICS

Identifiers: BID-35850, BID-35851, CVE-2009-2406, CVE-2009-2407,
DSA 1844-1, DSA 1845-1, FEDORA-2009-8144, FEDORA-2009-8264,
RHSA-2009:1193-01, RISE-2009002, RISE-2009003, VIGILANCE-VUL-8899

http://vigilance.fr/vulnerability/Linux-kernel-privilege-elevation-via-eCryptfs-8899


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