Timing attack in py-django (Alpine package)

1) Timing attack

EUVDB-ID: #VU1605

Risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-2513

CWE-ID: CWE-208 - Information Exposure Through Timing Discrepancy

Exploit availability: No

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information on the target system.

The weakness exists in the password hasher in contrib/auth/hashers.py due to creating a timing difference between a login request for a user with a password encoded in an older number of iterations and login request for a nonexistent user. A remote attacker can enumerate users via a timing attack involving login requests.

Mitigation

Install update from vendor's website.

Vulnerable software versions

py-django (Alpine package): 1.8.3-r0 - 1.8.8-r0

CPE2.3

• cpe:2.3:o:alpine:py-django_alpine_package:1.8.3-r0:*:*:*:*:alpine_linux:*:3.1
• cpe:2.3:o:alpine:py-django_alpine_package:1.8.3-r1:*:*:*:*:alpine_linux:*:3.1
• cpe:2.3:o:alpine:py-django_alpine_package:1.8.7-r0:*:*:*:*:alpine_linux:*:3.2

External links

https://git.alpinelinux.org/aports/commit/?id=9cccfec3eb073453dec9377d17d2274a597f9c38
https://git.alpinelinux.org/aports/commit/?id=c664cec043c97d3bb36627af084d60ebdd97105b

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.