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Vigil@nce: apt, two vulnerabilities

April 2009 by Vigil@nce

Two apt vulnerabilities lead to the non-installation of packages or to the installation of malicious packages.

- Severity: 2/4
- Consequences: data creation/edition, data flow
- Provenance: intranet server
- Means of attack: no proof of concept, no attack
- Ability of attacker: expert (4/4)
- Confidence: confirmed by the editor (5/5)
- Diffusion of the vulnerable configuration: high (3/3)
- Number of vulnerabilities in this bulletin: 2
- Creation date: 22/04/2009

IMPACTED PRODUCTS

- Debian Linux

DESCRIPTION OF THE VULNERABILITY

The apt program is used to install packages, and to handle security updates. It is impacted by two vulnerabilities.

The /etc/cron.daily/apt cron does not check the return code of the "date" command which indicates the system time. During a Daylight Saving Time change, an error thus occurs and packages are not updated. [grav:2/4; 354793, 523213, CVE-2009-1300]

The apt program uses gpgv to check the signature of packets. The gpgv command returns VALIDSIG if the signature is valid, and GOODSIG is the signature is valid and made with a valid key. However, apt checks VALIDSIG instead of GOODSIG. Packets signed with an expired or revoked key are thus accepted. [grav:2/4; 356012, BID-34630, CVE-2009-1358]

CHARACTERISTICS

- Identifiers: 354793, 356012, 523213, BID-34630, CVE-2009-1300, CVE-2009-1358, DSA 1779-1, VIGILANCE-VUL-8659
- Url: http://vigilance.fr/vulnerability/apt-two-vulnerabilities-8659




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