Amazon Linux AMI update for nginx

1) Stack-based buffer overflow

EUVDB-ID: #VU42707

Risk: Medium

CVSSv3.1: 6.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:F/RL:O/RC:C]

CVE-ID: CVE-2013-2028

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the ngx_http_parse_chunked function in http/ngx_http_parse.c when processing a chunked Transfer-Encoding request with a large chunk size, which triggers an integer signedness error and a stack-based buffer overflow. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Update the affected packages:

i686:
    nginx-debuginfo-1.2.9-1.11.amzn1.i686
    nginx-1.2.9-1.11.amzn1.i686

src:
    nginx-1.2.9-1.11.amzn1.src

x86_64:
    nginx-1.2.9-1.11.amzn1.x86_64
    nginx-debuginfo-1.2.9-1.11.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2013-189.html

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.

2) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU32679

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-2070

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to #BASIC_IMPACT#.

http/modules/ngx_http_proxy_module.c in nginx 1.1.4 through 1.2.8 and 1.3.0 through 1.4.0, when proxy_pass is used with untrusted HTTP servers, allows remote attackers to cause a denial of service (crash) and obtain sensitive information from worker process memory via a crafted proxy response, a similar vulnerability to CVE-2013-2028.

Mitigation

Update the affected packages:

i686:
    nginx-debuginfo-1.2.9-1.11.amzn1.i686
    nginx-1.2.9-1.11.amzn1.i686

src:
    nginx-1.2.9-1.11.amzn1.src

x86_64:
    nginx-1.2.9-1.11.amzn1.x86_64
    nginx-debuginfo-1.2.9-1.11.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2013-189.html

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.