VDB-107092 · CVE-2015-5327 · BID 107890

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

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

Summaryinfo

A vulnerability was found in Linux Kernel 4.3-rc1. It has been declared as critical. The impacted element is the function x509_decode_time of the file x509_cert_parser.c. Executing a manipulation can lead to out-of-bounds. This vulnerability is tracked as CVE-2015-5327. The attack can be launched remotely. No exploit exists.

Detailsinfo

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 out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Out-of-bounds memory read in the x509_decode_time function in x509_cert_parser.c in Linux kernels 4.3-rc1 and after.

The bug was discovered 11/27/2015. The weakness was disclosed 09/25/2017 (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 12/30/2022).

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 VDB-82964, VDB-115786, VDB-131935 and VDB-133369 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfo

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 🔍
12/30/2022 +1367 days 🔍

Sourcesinfo

Vendor: kernel.org

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

CVE: CVE-2015-5327 (🔍)
GCVE (CVE): GCVE-0-2015-5327
GCVE (VulDB): GCVE-100-107092
SecurityFocus: 107890 - Linux Kernel CVE-2019-11190 Local Security Bypass Vulnerability

See also: 🔍

Entryinfo

Created: 09/26/2017 09:01
Updated: 12/30/2022 08:49
Changes: 09/26/2017 09:01 (65), 11/19/2019 13:12 (3), 01/14/2021 12:06 (3), 12/30/2022 08:49 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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