PT-2017-1614 · Linux+2 · Linux Kernel+2

Antonio Barresi + 3 · Publicado 2017-03-02 · Atualizado 2024-08-06 · CVE-2015-2877

Positive Technologies (AI Summary)

CVSS v3.1

3.3

Baixa

Vetor base

AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions Linux kernel versions 2.6.32 through 4.x

Description The issue is related to the Kernel Samepage Merging (KSM) component in the Linux kernel, which does not prevent the use of a write-timing side channel. This allows guest OS users to defeat the Address Space Layout Randomization (ASLR) protection mechanism on other guest OS instances via a Cross-VM ASL Introspection (CAIN) attack. The vendor suggests disabling deduplication to mitigate this attack vector. This issue can be classified as a potentially misunderstood behavior rather than a vulnerability, as share-until-written approaches for memory conservation among mutually untrusting tenants are inherently detectable for information disclosure.

Recommendations For Linux kernel versions 2.6.32 through 4.x, consider disabling deduplication to mitigate the risk of exploitation. As a temporary workaround, restrict the use of the Kernel Samepage Merging (KSM) component until a more comprehensive solution is available.

Exploit

Correção

Information Disclosure

Enumeração de Fraquezas

CWE-200

Identificadores relacionados

ALT-PU-2019-1437

ALT-PU-2019-1506

ALT-PU-2020-1198

ALT-PU-2020-1501

ALT-PU-2020-2410

ALT-PU-2020-2433

ALT-PU-2021-1870

BDU:2017-00767

CVE-2015-2877

ECHO-2F13-916F-4C84

Produtos afetados

Alt Linux

Debian

Linux Kernel

Referências · 817

• 🔥 https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/rds_atomic_free_op_null_pointer_deref_priv_esc.rb · Exploit
• 🔥 https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19036 · Exploit
• 🔥 https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19039 · Exploit
• 🔥 https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19816 · Exploit
• 🔥 https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19037 · Exploit
• 🔥 https://github.com/tr3ee/CVE-2021-4204 · Exploit
• 🔥 https://github.com/xmzyshypnc/CVE-2020-27194 · Exploit
• 🔥 https://github.com/kiks7/CVE-2020-27786-Kernel-Exploit · Exploit
• 🔥 https://github.com/tdwyer/CVE-2020-25705 · Exploit
• 🔥 https://github.com/Limesss/cve-2019-18683 · Exploit
• 🔥 https://github.com/bobfuzzer/CVE-2019-18885 · Exploit
• 🔥 https://github.com/ii4gsp/CVE-2020-27786 · Exploit
• https://github.com/torvalds/linux/commit/ceabee6c59943bdd5e1da1a6a20dc7ee5f8113a2 · Nota
• https://github.com/torvalds/linux/commit/01ca667133d019edc9f0a1f70a272447c84ec41f · Nota
• https://github.com/torvalds/linux/commit/088aaf17aa79300cab14dbee2569c58cfafd7d6e · Nota