FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

libotr -- buffer overflows

Affected packages
libotr < 3.2.1


VuXML ID c651c898-e90d-11e1-b230-0024e830109b
Discovery 2012-07-27
Entry 2012-08-18

OTR developers report:

The otrl_base64_otr_decode() function and similar functions within OTR suffer from buffer overflows in the case of malformed input; specifically if a message of the format of "?OTR:===." is received then a zero-byte allocation is performed without a similar correlation between the subsequent base64 decoding write, as such it becomes possible to write between zero and three bytes incorrectly to the heap, albeit only with a value of '='.

Because this code path is highly utilized, specifically in the reception of instant messages over pidgin or similar, this vulnerability is considered severe even though in many platforms and circumstances the bug would yield an unexploitable state and result simply in denial of service.

The developers of OTR promptly fixed the errors and users of OTR are advised to upgrade the software at the next release cycle.


CVE Name CVE-2012-3461