Linux Kernel up to 5.0.7 fs/binfmt_aout.c install_exec_creds race condition
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
3.9 | $0-$5k | 0.00 |
A vulnerability was found in Linux Kernel up to 5.0.7 (Operating System). It has been rated as problematic. Affected by this issue is the function install_exec_creds
of the file fs/binfmt_aout.c. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is confidentiality, integrity, and availability. CVE summarizes:
The Linux kernel through 5.0.7, when CONFIG_IA32_AOUT is enabled and ia32_aout is loaded, allows local users to bypass ASLR on setuid a.out programs (if any exist) because install_exec_creds() is called too late in load_aout_binary() in fs/binfmt_aout.c, and thus the ptrace_may_access() check has a race condition when reading /proc/pid/stat.
The bug was discovered 04/18/2019. The weakness was published 04/12/2019 (Website). The advisory is available at securityfocus.com. This vulnerability is handled as CVE-2019-11191 since 04/11/2019. Local access is required to approach this attack. Required for exploitation is a simple authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/29/2023).
The commercial vulnerability scanner Qualys is able to test this issue with plugin 197486 (Ubuntu Security Notification for Linux, Linux-aws, Linux-kvm, Linux-raspi2, Linux-snapdragon Vulnerabilities (USN-4008-1)).
There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.
Similar entries are available at 82964, 107092, 115786 and 131935.
Product
Type
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 3.9VulDB Meta Temp Score: 3.9
VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 2.5
NVD Vector: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
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Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
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unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
NVD Base Score: 🔍
Exploiting
Class: Race conditionCWE: CWE-362
ATT&CK: Unknown
Local: Yes
Remote: No
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
Qualys ID: 🔍
Qualys Name: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: no mitigation knownStatus: 🔍
0-Day Time: 🔍
Timeline
04/03/2019 🔍04/11/2019 🔍
04/12/2019 🔍
04/12/2019 🔍
04/18/2019 🔍
08/29/2023 🔍
Sources
Vendor: kernel.orgAdvisory: USN-4006-1⛔
Status: Confirmed
CVE: CVE-2019-11191 (🔍)
SecurityFocus: 107890 - Linux Kernel CVE-2019-11190 Local Security Bypass Vulnerability
See also: 🔍
Entry
Created: 04/12/2019 09:42Updated: 08/29/2023 08:30
Changes: 04/12/2019 09:42 (61), 05/29/2020 12:29 (4), 08/29/2023 08:30 (3)
Complete: 🔍
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