Ubuntu update for Apache HTTP Server



Published: 2017-09-21
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-9798
CWE-ID CWE-416
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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Operating systems & Components / Operating system

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Use-after-free

EUVDB-ID: #VU8504

Risk: Low

CVSSv3.1: 5.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N/E:F/RL:O/RC:C]

CVE-ID: CVE-2017-9798

CWE-ID: CWE-416 - Use After Free

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due to use-after-free error when processing HTTP OPTIONS requests in server/core.c, when limits are configured in .htaccess or httpd.conf configuration files. A remote unauthenticated attacker can read portions of memory through HTTP OPTIONS requests and gain access to potentially sensitive data.

The vulnerability is dubbed Optionsbleed.

Mitigation

Update the affected packages.

Ubuntu 17.04:
apache2-bin 2.4.25-3ubuntu2.3
Ubuntu 16.04 LTS:
apache2-bin 2.4.18-2ubuntu3.5
Ubuntu 14.04 LTS:
apache2-bin 2.4.7-1ubuntu4.18

Vulnerable software versions

Ubuntu: 14.04 - 17.04

External links

http://www.ubuntu.com/usn/usn-3425-1/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.



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