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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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