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computer vulnerability bulletin CVE-2010-3618

PGP Desktop: incorrect validation of signature

Synthesis of the vulnerability

An attacker can inject data in a valid OpenPGP message, in order to force PGP Desktop to recognize this data as signed.
Impacted software: PGP Desktop.
Severity of this computer vulnerability: 3/4.
Consequences of a hack: data flow, disguisement.
Attacker's origin: document.
Creation date: 19/11/2010.
Références of this announce: BID-44920, CERTA-2010-AVI-566, CVE-2010-3618, SYM10-012, VIGILANCE-VUL-10138, VU#300785.

Description of the vulnerability

The RFC 4880 defines the format of OpenPGP messages. They are composed of data packets, which are signed and/or encrypted.

When an attacker captured an OpenPGP message between a sender and a receiver, he can:
 - insert an unsigned packet (if the message contains a signed packet)
 - insert an encrypted but unsigned packet (if the message contains an encrypted and signed packet)
In both cases, the PGP Desktop of the receiver displays two data packets, and indicates that they are both signed.

An attacker can therefore inject data in a valid OpenPGP message, in order to force PGP Desktop to recognize this data as signed.
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