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OVAL Definitions
>
OVAL Definition Details
Id
oval:ru.altx-soft.freebsd:def:8750
[Eng]
Version
1
Class
vulnerability
ALTXid
202654
Language
Russian
Severity
NotAvailable
Title
Уязвимость в Cyrus IMAPd
Description
To support MULTIAPPENDS the cmd_append handler uses the global stage array. This array is one of the things that gets destructed when the fatal() function is triggered. When the Cyrus IMAP code adds new entries to this array this is done with the help of the postfix increment operator in combination with memory allocation functions. The increment is performed on a global variable counting the number of allocated stages. Because the memory allocation function can fail and therefore internally call fatal() this construct is undefined arcording to ANSI C. This means that it is not clearly defined if the numstage counter is already increased when fatal() is called or not. While older gcc versions increase the counter after the memory allocation function has returned, on newer gcc versions (3.x) the counter gets actually increased before. In such a case the stage destructing process will try to free an uninitialised and maybe attacker supplied pointer. Which again could lead to remote code execution. (Because it is hard for an attacker to let the memory allocation functions fail in the right moment no PoC code for this problem was designed)
Family
unix
Platform
FreeBSD
Product
Cyrus IMAPd
Reference
FreeBSD: 31952117-3d17-11d9-8818-008088034841
FreeBSD: 31952117-3d17-11d9-8818-008088034841
Id:
31952117-3d17-11d9-8818-008088034841
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