Linux Kernel 4.3-rc1 x509_cert_parser.c x509_decode_time out-of-bounds read

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CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.4$0-$5k0.00

A vulnerability classified as critical was found in Linux Kernel 4.3-rc1 (Operating System). This vulnerability affects the function x509_decode_time of the file x509_cert_parser.c. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-125. As an impact it is known to affect confidentiality, integrity, and availability.

The bug was discovered 11/27/2015. The weakness was disclosed 09/25/2017 by Federico Bento (oss-sec). The advisory is shared for download at openwall.com. This vulnerability was named CVE-2015-5327 since 07/01/2015. The exploitation appears to be easy. The attack can be initiated remotely. Required for exploitation is a single authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 01/14/2021).

The vulnerability was handled as a non-public zero-day exploit for at least 668 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157983 (Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2019-4642)).

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

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 107890). The entries 82964, 115786, 131935 and 133369 are pretty similar.

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VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2infoedit

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VulDB Base Score: 🔍
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Exploitinginfoedit

Class: Information disclosure
CWE: CWE-125
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
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Threat Intelligenceinfoedit

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Countermeasuresinfoedit

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfoedit

07/01/2015 🔍
11/27/2015 +149 days 🔍
09/25/2017 +668 days 🔍
09/25/2017 +0 days 🔍
09/26/2017 +1 days 🔍
04/03/2019 +554 days 🔍
01/14/2021 +652 days 🔍

Sourcesinfoedit

Vendor: https://www.kernel.org/

Advisory: openwall.com
Researcher: Federico Bento
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-5327 (🔍)
SecurityFocus: 107890 - Linux Kernel CVE-2019-11190 Local Security Bypass Vulnerability

See also: 🔍

Entryinfoedit

Created: 09/26/2017 09:01 AM
Updated: 01/14/2021 12:06 PM
Changes: (3) advisory_person_name exploit_price_0day vulnerability_cvss2_nvd_basescore
Complete: 🔍

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