Gentoo update for Bash



| Updated: 2017-01-01
Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2016-7543
CVE-2016-9401
CWE-ID CWE-77
CWE-416
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Gentoo Linux
Operating systems & Components / Operating system

Vendor Gentoo

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Command injection

EUVDB-ID: #VU13104

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-7543

CWE-ID: CWE-77 - Command injection

Exploit availability: No

Description

The vulnerability allows a local attacker to execute arbitrary commands on the target system.

The weakness exists due to insufficient validation of user-supplied input. A local attacker can supply specially crafted SHELLOPTS and PS4 environment variables, inject and execute arbitrary commands with root privileges.

Mitigation

Update the affected packages.
app-shells/bash to version:

Vulnerable software versions

Gentoo Linux: All versions

CPE2.3 External links

https://security.gentoo.org/
https://security.gentoo.org/glsa/201701-02


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Use-after-free

EUVDB-ID: #VU33511

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-9401

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local authenticated user to perform a denial of service (DoS) attack.

popd in bash might allow local users to bypass the restricted shell and cause a use-after-free via a crafted address.

Mitigation

Update the affected packages.
app-shells/bash to version:

Vulnerable software versions

Gentoo Linux: All versions

CPE2.3 External links

https://security.gentoo.org/
https://security.gentoo.org/glsa/201701-02


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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