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Vigil@nce: Sendmail, truncation of X.509 with null

January 2010 by Vigil@nce

SYNTHESIS OF THE VULNERABILITY

When Sendmail uses certificates, an attacker can send a X.509 certificate with a Subject/Issuer field containing a null character, in order to bypass access restrictions.

Severity: 2/4

Consequences: data reading

Provenance: internet client

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)

Creation date: 31/12/2009

IMPACTED PRODUCTS

- Sendmail

DESCRIPTION OF THE VULNERABILITY

Sendmail can be configured to use X.509 certificates.

However, when a X.509 certificate contains a null character in the Subject/Issuer field, Sendmail truncates this field. This vulnerability is similar to VIGILANCE-VUL-8908 (https://vigilance.fr/tree/1/8908), even if the vulnerable source code is different.

When Sendmail uses certificates, an attacker can therefore send a X.509 certificate with a Subject/Issuer field containing a null character, in order to bypass access restrictions.

CHARACTERISTICS

Identifiers: BID-37543, VIGILANCE-VUL-9321

http://vigilance.fr/vulnerability/S...




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